Fully functioning KISS TNC

CHANGELOG.md

@@ -0,0 +1,39 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+    Added     : for new features.
+    Changed   : for changes in existing functionality.
+    Deprecated: for soon-to-be removed features.
+    Removed   : for now removed features.
+    Fixed     : for any bug fixes.
+    Security  : in case of vulnerabilities.
+
+## [1.0.0] - pre 2022-05-10
+First (more or less) working version.
+
+## [1.0.1] - 2022-05-10
+
+### Added
+- Support for saving settings to internal FLASH
+
+## [1.0.2] - 2022-05-11
+
+### Added
+- APRS settings can now be saved in FLASH
+- logging to serial USB is disabled when in KISS mode (but KISS mode still needs to be implemented)
+
+## [1.0.3] - 2022-05-12
+
+### Added
+- All settings (LoRa and APRS) can now be saved to FLASH.
+- Command added for restarting LoRa radio when settings are alterred: "restart lora"
+- Received LoRa frames can now be converted to proper AX25 frames (needed for KISS TNC functionality)
+- KISS mode works for receiving (LoRa -> USB port)
+- KISS mode for transmitting in early phase of development
+- Can enter KISS mode with command "kiss 1" and exit KISS mode with command "sudo kissparms -p ax0 -x"
+
+## [1.0.4] - 2022-05-13
+
+### Added
+- Fully functioning KISS TNC, but repeater flag could not be tested because LoRa APRS software in general is a mess. It appears that nobody reads the AX.25 standard anymore. This software probably is also not up to spec. But at least I tried! You should too: [http://www.ax25.net/AX25.2.2-Jul%2098-2.pdf](http://www.ax25.net/AX25.2.2-Jul%2098-2.pdf)

README.md

@@ -1,5 +1,5 @@
 # lora_aprs_node_pico
-A simple LoRa APRS module which can be used as a remote data logger and/or remote I/O controller. It is an evolution of another project of mine: [https://www.meezenest.nl/mees-elektronica/aprs_telemetry.html](https://www.meezenest.nl/mees-elektronica/aprs_telemetry.html)
+A simple LoRa APRS module which can be used as a remote data logger and/or remote I/O controller. See my website for more information: [https://www.meezenest.nl/mees-elektronica/RPi-pico-LoRa-APRS.html](https://www.meezenest.nl/mees-elektronica/RPi-pico-LoRa-APRS.html). It is an evolution of another project of mine: [https://www.meezenest.nl/mees-elektronica/aprs_telemetry.html](https://www.meezenest.nl/mees-elektronica/aprs_telemetry.html)
 
 This program is written for the RP2040 C++ SDK.
 

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build/src/CMakeFiles/LoRa_print.dir/progress.make

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build/src/CMakeFiles/main.dir/CXX.includecache

@@ -148,6 +148,16 @@ pico.h
 hardware/regs/addressmap.h
 ../pico-sdk/src/rp2_common/hardware_base/include/hardware/hardware/regs/addressmap.h
 
+../pico-sdk/src/rp2_common/hardware_claim/include/hardware/claim.h
+pico.h
+../pico-sdk/src/rp2_common/hardware_claim/include/hardware/pico.h
+hardware/sync.h
+../pico-sdk/src/rp2_common/hardware_claim/include/hardware/hardware/sync.h
+
+../pico-sdk/src/rp2_common/hardware_flash/include/hardware/flash.h
+pico.h
+../pico-sdk/src/rp2_common/hardware_flash/include/hardware/pico.h
+
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 pico.h
 ../pico-sdk/src/rp2_common/hardware_gpio/include/hardware/pico.h
@@ -166,6 +176,14 @@ hardware/structs/spi.h
 hardware/regs/dreq.h
 ../pico-sdk/src/rp2_common/hardware_spi/include/hardware/hardware/regs/dreq.h
 
+../pico-sdk/src/rp2_common/hardware_sync/include/hardware/sync.h
+pico.h
+../pico-sdk/src/rp2_common/hardware_sync/include/hardware/pico.h
+hardware/address_mapped.h
+../pico-sdk/src/rp2_common/hardware_sync/include/hardware/hardware/address_mapped.h
+hardware/regs/sio.h
+../pico-sdk/src/rp2_common/hardware_sync/include/hardware/hardware/regs/sio.h
+
 ../pico-sdk/src/rp2_common/hardware_timer/include/hardware/timer.h
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 ../pico-sdk/src/rp2_common/hardware_timer/include/hardware/pico.h
@@ -202,8 +220,6 @@ pico/stdio.h
 
 /home/marcel/Documents/electronische_projecten/lora_aprs_node_pico/src/Config.h
 
-/home/marcel/Documents/electronische_projecten/lora_aprs_node_pico/src/KISS.h
-
 /home/marcel/Documents/electronische_projecten/lora_aprs_node_pico/src/LoRa-RP2040.h
 pico/stdlib.h
 /home/marcel/Documents/electronische_projecten/lora_aprs_node_pico/src/pico/stdlib.h
@@ -226,6 +242,16 @@ stdio.h
 string
 -
 
+/home/marcel/Documents/electronische_projecten/lora_aprs_node_pico/src/kiss.h
+stdio.h
+-
+string.h
+-
+time.h
+-
+stdarg.h
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+
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@@ -233,16 +259,22 @@ string.h
 -
 time.h
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+stdarg.h
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 pico/stdlib.h
 /home/marcel/Documents/electronische_projecten/lora_aprs_node_pico/src/pico/stdlib.h
 pico/binary_info.h
 /home/marcel/Documents/electronische_projecten/lora_aprs_node_pico/src/pico/binary_info.h
+hardware/flash.h
+/home/marcel/Documents/electronische_projecten/lora_aprs_node_pico/src/hardware/flash.h
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 /home/marcel/Documents/electronische_projecten/lora_aprs_node_pico/src/LoRa-RP2040.h
 Config.h
 /home/marcel/Documents/electronische_projecten/lora_aprs_node_pico/src/Config.h
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+kiss.h
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+/home/marcel/Documents/electronische_projecten/lora_aprs_node_pico/src/kiss.h
+hardware/claim.h
+/home/marcel/Documents/electronische_projecten/lora_aprs_node_pico/src/hardware/claim.h
 
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  ../pico-sdk/src/rp2_common/hardware_base/include/hardware/address_mapped.h
+ ../pico-sdk/src/rp2_common/hardware_claim/include/hardware/claim.h
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  ../pico-sdk/src/rp2_common/hardware_gpio/include/hardware/gpio.h
  ../pico-sdk/src/rp2_common/hardware_spi/include/hardware/spi.h
+ ../pico-sdk/src/rp2_common/hardware_sync/include/hardware/sync.h
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  /home/marcel/Documents/electronische_projecten/lora_aprs_node_pico/src/Config.h
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  /home/marcel/Documents/electronische_projecten/lora_aprs_node_pico/src/Print.h
+ /home/marcel/Documents/electronische_projecten/lora_aprs_node_pico/src/kiss.h
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src/CMakeLists.txt

@@ -6,6 +6,7 @@ cmake_minimum_required(VERSION 3.12)
 
 add_library(LoRa_pico_lib LoRa-RP2040.cpp LoRa-RP2040.h)
 add_library(LoRa_print Print.h Print.cpp)
+add_library(KISS kiss.h kiss.cpp)
 
 target_link_libraries(LoRa_pico_lib pico_stdlib hardware_spi hardware_interp LoRa_print)
 
@@ -24,7 +25,7 @@ target_include_directories(main PUBLIC ./)
 
 target_link_directories(main PUBLIC ./)
 
-target_link_libraries(main pico_stdlib LoRa_pico_lib LoRa_print)
+target_link_libraries(main pico_stdlib LoRa_pico_lib LoRa_print KISS)
 
 # enable usb output, disable uart output
 pico_enable_stdio_usb(main 1)

src/Config.h

@@ -21,20 +21,13 @@
   #define OFF 0
   #define ON 1
     
+  #define CR		13
+  
   const long serialBaudRate   = 38400;
   const int  rssiOffset      = 292;
 
   const int  loraRxTurnaround = 50;
 
-  // Default LoRa settings
-  int       loraSpreadingFactor = 12;
-  int       loraPreamble        = 8;
-  int       loraCodingRate      = 5;
-  int       loraTxPower         = 17;
-  int       LoRaPaSelect        = 1;
-  uint32_t  loraBandwidth       = 125E3;
-  uint32_t  loraFrequency       = 433775000;
-
   uint8_t txBuffer[MTU];
   uint8_t rxBuffer[MTU];
 
@@ -60,14 +53,31 @@
   const uint8_t SIG_SYNCED = 0x02;
   const uint8_t RX_ONGOING = 0x04;
   
+  // The size of this struc should be a exactly 256 bytes (or a multiple), which is the FLASH_PAGE_SIZE of the RPi pico's flash memory
+  // Struct can not be bigger than 4kbyte
   struct aprssettings {
-      uint8_t MyCall[10] = { 'P','E','1','R','X','F','-','5', 0} ;
+      uint8_t ValidFlashData = 0x5A;  // Indicates flash contains valid data - 1 bytes
-      uint8_t ServerCall[10] = { 'P','E','1','R','X','F','-','3', 0} ;
+      uint8_t MyCall[10] = { 'P','E','1','R','X','F','-','5', 0, 0} ;      // 10 bytes
-      uint8_t Destination[10] = { 'A','P','Z','M','D','M', 0} ;
+      uint8_t ServerCall[10] = { 'P','E','1','R','X','F','-','3', 0, 0} ;  // 10 bytes
-      uint8_t Path1[10] = { 0,'I','D','E','1','-', '1', 0} ;
+      uint8_t Destination[10] = { 'A','P','Z','M','D','M', 0, 0, 0 ,0} ;   // 10 bytes
-      uint8_t Path2[10] = { 0,'I','D','E','2','-', '2', 0} ; 
+      uint8_t Path1[10] = { 0,'I','D','E','1','-', '1', 0, 0, 0} ;         // 10 bytes
+      uint8_t Path2[10] = { 0,'I','D','E','2','-', '2', 0, 0 ,0} ;         // 10 bytes
             
-      uint8_t FirmwareVersion[20] = { 'V','1',',','C','o','n','t','r', 'o','l','l','e','r',' ','0','1', 0} ;
+      uint8_t FirmwareVersion[20] = { 'V','1',',','C','o','n','t','r', 'o','l','l','e','r',' ','0','1', 0, 0, 0, 0} ;
+                                                                        // 20 bytes
+                                                                       
+      // Default LoRa settings
+      uint16_t  loraSpreadingFactor = 12;                               // 2 bytes
+      uint16_t  loraPreamble        = 8;                                // 2 bytes
+      uint16_t  loraCodingRate      = 5;                                // 2 bytes
+      uint16_t  loraTxPower         = 17;                               // 2 bytes
+      uint16_t  loraPaSelect        = 1;                                // 2 bytes
+      uint32_t  loraBandwidth       = 125E3;                            // 4 bytes
+      uint32_t  loraFrequency       = 433775000;                        // 4 bytes
+      
+                                                                // Total 89 bytes
+      
+      uint8_t   FillerData[163];
   } AprsSettings;
   
   struct status {
@@ -77,6 +87,12 @@
       bool ControlRelay;
       
       uint8_t StatusString[6] = { '0','0','0','0','0',0};
+      
+      uint8_t DescriptionString[20] ={ 'N','C',',','C','n','t','r',',','5','V',',','1','2','V',',','2','4','V',0,0};
+      
+      uint8_t KissMode = OFF;
   } Status;
   
+
+
 #endif

src/KISS.h

@@ -1,28 +0,0 @@
-#ifndef KISS_H
-  #define KISS_H
-
-  #define FEND              0xC0
-  #define FESC              0xDB
-  #define TFEND             0xDC
-  #define TFESC             0xDD
-
-  #define CMD_UNKNOWN       0xFE
-  #define CMD_DATA          0x00
-  #define CMD_HARDWARE      0x06
-
-  #define HW_RSSI           0x21
-  
-  #define CMD_ERROR         0x90
-  #define ERROR_INITRADIO   0x01
-  #define ERROR_TXFAILED    0x02
-  #define ERROR_QUEUE_FULL  0x04
-
-  size_t frameLength;
-  bool inFrame                = false;
-  bool escape                 = false;
-  bool SERIAL_READING         = false;
-  uint8_t command             = CMD_UNKNOWN;
-  uint32_t lastSerialRead     = 0;
-  uint32_t serialReadTimeout  = 25;
-
-#endif

src/kiss.cpp

@@ -0,0 +1,460 @@
+#include "kiss.h"
+
+/*
+ * KISS encoder uses two steps:
+ * 
+ * Step 1: encodes the LoRa APRS frame into an AX.25 frame. DONE
+ * Step 2: encapsulates the AX.25 frame into a KISS frame. DONE
+ * 
+ *  struct aprs_frame {
+ *      uint8_t source_address[10];
+ *      uint8_t digi_path[255];
+ *      uint8_t data_field[255];
+ *      uint8_t message[255];
+ *      uint8_t digis[10][10];
+ *      uint8_t acknowledge_number[255];
+ *      bool acknowledge_request = false;
+ *      uint16_t server_command = 0;
+ *      uint16_t number_of_digipeaters = 0;
+ *      
+ *      uint8_t valid_apsr_data = false;
+ *  };
+ *
+ */
+uint16_t KissClass::EncodeFrame(struct aprs_frame *aprsframe, struct ax25_frame *ax25frame)
+{
+    uint8_t *encoded_call;
+    uint16_t cnt=0;
+    uint16_t position = 0;
+    uint8_t digi_cnt = 0;
+    uint8_t escaped_string_cnt=0;
+    
+    //printf("Encode KISS");
+    
+    // Destination call
+    //printf("Destination: ");
+    encoded_call = EncodeCall(aprsframe->digis[0]);
+    cnt = 0;
+    while (cnt < 7)
+    {
+        ax25frame->complete[position] = *(encoded_call+cnt);
+        //printf("0x%X ", *(encoded_call+cnt));
+        //printf("0x%X ", ax25frame->complete[position]);
+        cnt++;
+        position++;
+    }
+    //printf("\n");
+    
+    // Source call
+    //printf("Source: ");
+    cnt=0;
+    encoded_call = EncodeCall(aprsframe->source_address);
+    while (cnt < 7)
+    {
+        ax25frame->complete[position] = *(encoded_call+cnt);
+        //printf("0x%X ", *(encoded_call+cnt));
+        //printf("0x%X ", ax25frame->complete[position]);
+        cnt++;
+        position++;
+    }
+    //printf("\n");
+    
+    // No digipeaters in path, so destination is the last call and therefore the 'last' flag should be set
+    if (aprsframe->number_of_digipeaters == 0)
+    {
+        ax25frame->complete[position-1] |= 0x01;
+    }
+    else
+    {
+
+        // Path (digipeaters)
+        //printf("Path: ");
+        cnt=0;
+        digi_cnt = 1;       // Start at position 1 as position 0 contains destination (which we already encoded)
+        while (aprsframe->number_of_digipeaters-- != 0) {
+            
+            encoded_call = EncodeCall(aprsframe->digis[digi_cnt]);            
+            while (cnt < 7) {
+                ax25frame->complete[position] = *(encoded_call+cnt);
+                //printf("0x%X ", *(encoded_call+cnt));
+                //printf("0x%X ", ax25frame->complete[position]);
+                cnt++;
+                position++;
+            }
+            digi_cnt++;
+            cnt = 0;
+            
+        }
+        //printf("\n");
+        
+        // Set 'last' flag
+        ax25frame->complete[position-1] |= 0x01;
+    }
+    
+    // Add control fields
+    ax25frame->complete[position++] = 0x03;
+    ax25frame->complete[position++] = 0xF0;
+    
+    // All the dificult bits are done, now we just add the payload.
+    //printf("Data:");
+    cnt = 0;
+    while (aprsframe->data_field[cnt] != 0 && cnt < 256) {
+        ax25frame->complete[position] = aprsframe->data_field[cnt];
+        //printf("0x%X ", ax25frame->complete[position]);
+        cnt++;
+        position++;
+    }
+    //printf( "\n");
+    
+    // Store length of AX25 frame
+    ax25frame->lenght = position;
+    
+    // Encapsulate AX.25 frame in KISS frame (including escaping FEND codes)    
+    putchar(FEND);
+    putchar(CMD_DATA);
+    escaped_string_cnt=0;
+    ax25frame->encoded_kiss_frame[escaped_string_cnt++] = FEND;
+    ax25frame->encoded_kiss_frame[escaped_string_cnt++] = CMD_DATA;
+    cnt=0;
+    position=ax25frame->lenght;
+    while (position-- != 0)
+    {
+        // Escape FESC and TFEND
+        if (ax25frame->complete[cnt] == FEND) {
+            putchar(FESC);
+            putchar(TFEND);
+            ax25frame->encoded_kiss_frame[escaped_string_cnt++] = FESC;
+            ax25frame->encoded_kiss_frame[escaped_string_cnt++] = TFEND;
+        } else if (ax25frame->complete[cnt] == FESC) {
+            putchar(FESC);
+            putchar(TFESC);
+            ax25frame->encoded_kiss_frame[escaped_string_cnt++] = FESC;
+            ax25frame->encoded_kiss_frame[escaped_string_cnt++] = TFESC;
+        } else {
+            putchar(ax25frame->complete[cnt]);
+            ax25frame->encoded_kiss_frame[escaped_string_cnt++] = ax25frame->complete[cnt];
+        }
+        cnt++;
+    }
+    putchar(FEND);
+    ax25frame->encoded_kiss_frame[escaped_string_cnt++] = FEND;
+    //printf("\n");
+    
+
+    return 0;
+}
+
+/*
+ * Decodes a KISS frame from the usb serial port
+ * 
+ * Input : string starting with FEND and ending with FEND
+ * Output: filled struct AprsFrame
+ * Return: 0 = OK, 1 = ERROR, 2 = EXIT KISS MODE
+ */
+uint16_t KissClass::DecodeFrame(uint8_t string[], struct kiss_tx_frame *kisstxframe)
+{
+    uint16_t position  =0 ;
+    uint16_t loop_counter = 0;
+    uint16_t cnt  =0 ;
+    uint16_t ssid = 0;
+    uint16_t last_digi = 0;
+    uint16_t digi_cnt = 0;
+    
+    //printf("Decode KISS");
+    
+    kisstxframe->valid_data = false;
+    
+    // Not a valid frame
+    if (string[position] != FEND)
+        return 1;
+    
+    position++;
+    
+    // Is data frame: we de-escape the string and put it back in the same string with a NULL at the end as terminator.
+    if (string[position] == CMD_DATA)
+    {
+        position++;
+        while (string[position] != FEND)
+        {
+            // De-escape codes
+            if (string[position] == FESC && string[position+1] == TFEND)
+            {
+                string[cnt] = FEND;
+                position++;
+            }
+            else if (string[position] == FESC && string[position+1] == TFESC)
+            {
+                string[cnt] = FESC;
+                position++;
+            }
+            else {
+                string[cnt] = string[position];
+            }
+            cnt++;
+            position++;
+        }
+       string[cnt] = 0;             //Terminate string
+        
+    }
+    // Is command to exit KISS MODE
+    else if (string[position] == CMD_EXIT_KISS) {
+        return 2;
+    }
+    
+    // If we are here we have a valid AX.25 frame in 'string' which is decapsulated from its KISS frame
+    /*
+    0-5 destination
+    6 destination ssid
+    7-12 source
+    13 desitination sidd
+    
+    vanaf byte 13 LAST FLAG zoeken
+    
+    03
+    f0
+    payload tot aan NULL
+    */
+    
+    // Decode destination call
+    position = 0;
+    cnt = 0;
+    loop_counter = 0;
+    while (loop_counter < 6)
+    {
+        kisstxframe->digis[0][cnt] = string[position] >> 1;
+        // Remove space
+        if (kisstxframe->digis[0][cnt] == ' ')
+            cnt--;
+        position++;
+        loop_counter++;
+        cnt++;
+        //printf("%u ", position);
+    }
+    
+    // Extract SSID
+    //printf("position: %u\n", position);
+    ssid = (string[position] & 0b00011110) >> 1;
+    //printf("DIGI SSID: %u (%u)\n", ssid, position);
+    
+    // Place SSID behind call or not if it is zero
+    if (ssid != 0) {
+        kisstxframe->digis[0][cnt++] = '-';
+        if (ssid < 10)
+        {
+            kisstxframe->digis[0][cnt++] = ssid + 48;
+        }
+        else
+        {
+            kisstxframe->digis[0][cnt++] = '1';
+            kisstxframe->digis[0][cnt++] = (ssid%10)+48;
+        }
+    }
+    // Is has-been-repeated flag set?
+    if(string[position] & 0b10000000) {
+        kisstxframe->digis[0][cnt] = '*';
+        cnt++;
+    }
+    kisstxframe->digis[0][cnt] = 0;   //terminate string
+    position++;
+    
+    // Decode source call
+    cnt = 0;
+    loop_counter=0;
+    while (loop_counter < 6)
+    {
+        kisstxframe->source_address[cnt] = string[position] >> 1;
+        // Remove space
+        if (kisstxframe->source_address[cnt] == ' ')
+            cnt--;
+        position++;
+        loop_counter++;
+        cnt++;
+        //printf("%u ", position);
+    }
+    
+    // Extract SSID
+    ssid = (string[position] & 0b00011110) >> 1;
+    //printf("sources SSID: %u (%u)\n", ssid, position);
+    
+   // Place SSID behind call or not if it is zero
+    if (ssid != 0) {
+        kisstxframe->source_address[cnt++] = '-';
+        if (ssid < 10)
+        {
+            kisstxframe->source_address[cnt++] = ssid + 48;
+        }
+        else
+        {
+            kisstxframe->source_address[cnt++] = '1';
+            kisstxframe->source_address[cnt++] = (ssid%10)+48;
+        }
+    }
+    // Is has-been-repeated flag set?
+    if(string[position] & 0b10000000) {
+        kisstxframe->source_address[cnt] = '*';
+        cnt++;
+    }
+    kisstxframe->source_address[cnt] = 0;   //terminate string
+    
+    // Check LAST flag
+    if ( (string[position] & 0b00000001))
+        last_digi = 1;
+    
+    position++;
+     
+    // Decode digi path
+    digi_cnt=1;
+    while (last_digi == 0) {
+        
+        cnt = 0;
+        loop_counter=0;
+        while (loop_counter < 6)
+        {
+            kisstxframe->digis[digi_cnt][cnt] = string[position] >> 1;
+            // Remove space
+            if (kisstxframe->digis[digi_cnt][cnt] == ' ')
+                cnt--;
+            position++;
+            loop_counter++;
+            cnt++;
+            //printf("%u ", position);
+        }
+        
+        // Extract SSID
+        ssid = (string[position] & 0b00011110) >> 1;
+        //printf("DIGI  SSID: %u (%u)\n", ssid, position);
+        
+        // Place SSID behind call or not if it is zero
+        if (ssid != 0) {
+            kisstxframe->digis[digi_cnt][cnt++] = '-';
+            if (ssid < 10)
+            {
+                kisstxframe->digis[digi_cnt][cnt++] = ssid + 48;
+            }
+            else
+            {
+                kisstxframe->digis[digi_cnt][cnt++] = '1';
+                kisstxframe->digis[digi_cnt][cnt++] = (ssid%10) + 48;
+            }
+        }
+     
+        // Is has-been-repeated flag set?
+        if(string[position] & 0b10000000) {
+            kisstxframe->digis[digi_cnt][cnt] = '*';
+            cnt++;
+        }
+        kisstxframe->digis[digi_cnt][cnt] = 0;   //terminate string
+        
+        // Check LAST flag (also ends when more than 10 digis)
+        if ( (string[position] & 0b00000001) || digi_cnt > 8)
+            last_digi = 1;
+    
+        digi_cnt++;
+        position++;
+    }
+    kisstxframe->number_of_digipeaters = digi_cnt-1;
+    //printf("Digipeaters: %u \n",kisstxframe->number_of_digipeaters );
+    
+    //Skip the two control fields
+    position++;
+    position++;
+   
+    //Rest of string up to NULL is payload
+    cnt = 0;
+    kisstxframe->data_field[cnt++] = ':';
+    while (string[position] != 0 && position < 512)
+    {
+        kisstxframe->data_field[cnt] = string[position];
+        position++;
+        cnt++;
+    }
+    kisstxframe->data_field[cnt] = 0;     //terminate string
+    
+    kisstxframe->valid_data = true;
+    
+    
+    return 0;
+}
+
+/*
+ * Encodes call according to AX.25 specs.
+ * 
+ * input : string with call and ssid as readable characters
+ * output: pointer to memory location (7 bytes with the encoded call)
+ * 
+ */
+uint8_t * KissClass::EncodeCall(uint8_t string[])
+{
+    uint8_t position = 0;
+    uint8_t cnt = 0;
+    uint8_t repeat_flag = 0;
+    
+    static uint8_t call[7] = { 0,0,0,0,0,0,0} ;
+    uint8_t ssid = 0;
+    
+    // if asterix is pressent in string, than the message has been repeated, so set the 'has been repeated' flag in the ssid register
+    // At the same time delete the asterix and place a NULL (string terminator) at its place. As the asterix should be the last character in the string, this should work.
+    position = 0;
+    while( string[position] != 0)
+    {
+        if (string[position] == '*') {
+            repeat_flag = 1;
+            string[position] == 0;
+            break;
+        }
+        
+        position++;
+    }
+    
+    position = 0;
+    // extract call
+    while( string[position] != 0 || cnt < 6)
+    {
+        if ( string[position] == '-') {
+            position++;
+            break;
+        } else {
+            call[cnt] = string[position] << 1;            
+        }
+        cnt++;
+        position++;
+    }
+    // pad with spaces to a length of 6
+    while( cnt < 6 )
+    {
+        call[cnt++] = ' ' << 1;
+    }
+    
+    // extract ssid
+    cnt=0;
+    while( string[position] != 0 )
+    {
+        if (string[position] >= 48 && string[position] <= 57) {
+            ssid = 10*ssid + string[position]-48;
+            position++;
+        }
+    }
+    
+    ssid = ssid << 1;
+    ssid |= 0b01100000;
+    
+    if (repeat_flag == 1)            
+        ssid |= 0b10000000;
+    
+    // add encoded ssid to encoded call array
+    call[6] = ssid;
+    
+    /*
+    //printf("SSID: 0x%X\n", ssid);
+    
+    cnt = 0;
+    while (cnt < 7)
+    {
+        //printf("0x%X ", call[cnt++]);
+    }
+    //printf("\n");
+    */
+    
+    return call;
+    
+}

src/kiss.h

@@ -0,0 +1,67 @@
+#ifndef KISS_H
+  #define KISS_H
+  #include <stdio.h>
+  #include <string.h>
+  #include <time.h>
+  #include <stdarg.h>
+
+  #define FEND              0xC0
+  #define FESC              0xDB
+  #define TFEND             0xDC
+  #define TFESC             0xDD
+
+  #define CMD_UNKNOWN       0xFE
+  #define CMD_DATA          0x00
+  #define CMD_HARDWARE      0x06
+  #define CMD_EXIT_KISS     0xFF
+
+  #define HW_RSSI           0x21
+  
+  #define CMD_ERROR         0x90
+  #define ERROR_INITRADIO   0x01
+  #define ERROR_TXFAILED    0x02
+  #define ERROR_QUEUE_FULL  0x04
+
+    struct aprs_frame {
+        uint8_t source_address[10];
+        uint8_t digi_path[255];
+        uint8_t data_field[255];
+        uint8_t message[255];
+        uint8_t digis[10][10];
+        uint8_t acknowledge_number[255];
+        bool acknowledge_request = false;
+        uint16_t server_command = 0;
+        uint16_t number_of_digipeaters = 0;
+        
+        uint8_t valid_apsr_data = false;
+    };
+
+    struct ax25_frame {
+        uint8_t complete[512];
+        uint16_t lenght = 0;
+        uint8_t encoded_kiss_frame[512];
+        uint8_t decoded_kiss_frame[512];
+        uint16_t kiss_length = 0;
+    };
+    
+    struct kiss_tx_frame {
+        uint8_t source_address[10];
+        uint8_t data_field[512];
+        uint8_t digis[10][10];
+        uint16_t number_of_digipeaters = 0;
+        
+        uint8_t lora_string[512];
+        
+        uint8_t valid_data = false;
+    };
+
+  class KissClass
+  {
+  public:
+      uint16_t EncodeFrame(struct aprs_frame *frame, struct ax25_frame *ax25frame);
+      uint16_t DecodeFrame(uint8_t string[], struct kiss_tx_frame *kisstxframe);
+  private:
+      uint8_t * EncodeCall(uint8_t string[]);
+  };
+
+#endif

src/main.cpp

@@ -1,14 +1,21 @@
 #include <stdio.h>
 #include <string.h>
 #include <time.h>
+#include <stdarg.h>
 #include "pico/stdlib.h"
 #include "pico/binary_info.h"
+#include "hardware/flash.h"
 #include "LoRa-RP2040.h"
 #include "Config.h"
-#include "KISS.h"
+#include "kiss.h"
+#include "hardware/claim.h"
+
+KissClass Kiss;
+struct ax25_frame AX25Frame;        //defined in kiss.h
+struct aprs_frame AprsFrame;        //defined in kiss.h
+struct kiss_tx_frame KissTxFrame;   //defined in kiss.h
 
 bool startRadio();
-bool LoadSettings();
 void getPacketData(int packetLength);
 int compare_strings(uint8_t a[], uint8_t b[]);
 bool is_message_for_me (uint8_t data[], uint8_t mycall[]);
@@ -18,6 +25,7 @@ uint16_t decode_packet ();
 
 /* declaration for transmit functions */
 void ComposeAprsFrame(uint8_t payload[]);
+void ComposeAprsFrameFromKiss();
 bool TransmitRequest = false;
 void transmit();
 
@@ -27,11 +35,98 @@ const uint PowerSupply5VControl  = 4;
 const uint RelayOffControl       = 2;
 const uint RelayOnControl        = 3;
 
-int main() {
+// We're going to use a region 512k from the start of flash as non volatile storage for our settings.
+// We can access this at XIP_BASE + 512k.
+#define FLASH_TARGET_OFFSET (512 * 1024)
 
-    uint16_t ServerCommand = 0;
+const uint8_t *flash_target_contents = (const uint8_t *) (XIP_BASE + FLASH_TARGET_OFFSET);
-    uint16_t TxDelay = 0;
 
+void log_out(const char *fmt, ...)
+{
+        char buf[256];
+        va_list args;
+        
+        if (Status.KissMode == OFF) {
+            va_start(args, fmt);
+
+            vsnprintf(buf, sizeof buf, fmt, args);
+
+            va_end( args);
+            
+            printf("%s", buf);
+        }
+
+}
+
+/*
+ * Saves settings in struct AprsSettings to FLASH memory
+ * Struct AprsSettings should be exactly a multiple of FLASH_PAGE_SIZE in size.
+ * 
+ * Returns: 0 when successfull
+ *          1 when error
+ */
+
+uint8_t SaveSettingsToFlash(void)
+{
+    uint32_t ints = save_and_disable_interrupts();
+        
+    // First we erase the FLASH sector we need. After that we can store new values.
+    // Note that a whole number of sectors must be erased at a time.
+    // Sector size is 4kB, so this is way bigger than the 256 bytes PAGE_SIZE for storing the settings.
+    // We can therefore store up to 16 blocks of 256 bytes per sector
+    log_out("Erasing FLASH region...");
+    flash_range_erase(FLASH_TARGET_OFFSET, FLASH_SECTOR_SIZE);
+    log_out("done\n");
+    log_out("Writing settings to FLASH...");    
+    flash_range_program(FLASH_TARGET_OFFSET, (uint8_t*)&AprsSettings, sizeof(AprsSettings) );
+    log_out("done\n");
+    restore_interrupts (ints);
+
+    return(0);
+}
+
+void ShowSettings(void)
+{
+    log_out("LoRa APRS remote switcher with build in KISS TNC.\n"); 
+    log_out(" Firmware version : %s\n",AprsSettings.FirmwareVersion);
+    log_out(" Size of struct   : %u.\n\n", sizeof(AprsSettings));
+    
+    log_out("APRS settings\n");
+    log_out("  My call         : %s\n", AprsSettings.MyCall);
+    log_out("  Server call     : %s\n", AprsSettings.ServerCall);
+    log_out("  Destination     : %s\n", AprsSettings.Destination);
+    log_out("  Path 1          : %s\n", AprsSettings.Path1);
+    log_out("  Path 2          : %s\n\n", AprsSettings.Path2);
+    
+    log_out("LoRa settings\n");
+    log_out("  Frequency       : %u\n", AprsSettings.loraFrequency);    
+    log_out("  SpreadingFactor : %i\n", AprsSettings.loraSpreadingFactor);    
+    log_out("  Preamble        : %i\n", AprsSettings.loraPreamble);    
+    log_out("  CodingRate      : %i\n", AprsSettings.loraCodingRate);    
+    log_out("  TxPower         : %i\n", AprsSettings.loraTxPower);    
+    log_out("  PaSelect        : %i\n", AprsSettings.loraPaSelect);    
+    log_out("  Bandwidth       : %u\n", AprsSettings.loraBandwidth); 
+}
+
+uint8_t ReadSettingsFromFlash(void)
+{
+    // If byte zero of flash contains 0x5A we assume the data to be valid, otherwise we fill the flash with default values.
+    if (flash_target_contents[0] != 0x5A)
+    {
+        log_out( "No valid data found in FLASH memory. Using default values.\n" );
+        memset(AprsSettings.FillerData, 0, sizeof(AprsSettings.FillerData));
+        SaveSettingsToFlash();
+        
+    } else {
+        // Read settings stored in flash memory
+        log_out("Found valid settings in FLASH memory.\n");
+    }
+    memcpy((uint8_t*)&AprsSettings, flash_target_contents, sizeof(AprsSettings));
+    ShowSettings();
+}
+
+void setup(void)
+{
     /* Among others, this initializes the USB-serial port at 115200bps 8N1 */
    stdio_init_all();
 
@@ -66,15 +161,365 @@ int main() {
    
    sleep_ms(5000);
    
-   LoadSettings();
+   ReadSettingsFromFlash();
    
    startRadio();
    
+}
+
+void print_help(void)
+{
+    log_out("Unknown command.\n\n");
+    log_out("kiss\n");
+    log_out("   Enter KISS mode.\n");
+    log_out("save\n");
+    log_out("   Save settings to flash.\n");
+    log_out("read <flash/ram>\n");
+    log_out("   Read settings from FLASH or RAM.\n");
+    log_out("mycall/servercall/destination/path1/path2\n");
+    log_out("   APRS settings.\n");
+    log_out("freq/spread/pre/rate/power/pa/band.\n");
+    log_out("   LoRa settings.\n");
+
+}
+
+/*
+ * Reads a string and converts it to its 32 bit value if it contains a number,
+ * else it returns 0xFFFFFFFF
+ */
+uint32_t ConvertStringToValue(char string[])
+{
+    uint16_t position = 0;
+    uint32_t value = 0;
+
+    // Extract value from string (if present)    
+    while( string[position] != 0 )
+    {
+        // Is character a number?
+        if (string[position] >= 48 && string[position] <= 57) {
+            value = 10*value + string[position]-48;
+        } else {
+            return 0xFFFFFFFF;
+        }
+        position++;
+        
+    }
+    return value;
+}
+
+void ProcessSerialInput(char string[])
+{
+    uint8_t cnt;
+    uint8_t position=0;
+    uint32_t tmp = 0;
+    
+    char command[100];
+    char parameter[100];
+    
+    //log_out("You wrote - %s (%u).\n", string, strlen(string));
+    
+    // Command cannot be any shorter than 3 characters
+    if (strlen(string) > 2) {
+        
+        // Extract command (part before space)
+        cnt = 0;    
+        while( string[position] != 0 )
+        {
+            command[cnt++] = string[position];
+            if ( string[position] == ' ' ) {
+                command[cnt-1] = 0;  // terminate command string
+                position++;
+                break;
+            }
+            position++;
+        }
+
+        // Extract parameter (part after space)
+        cnt = 0;    
+        while( string[position] != 0 )
+        {
+            parameter[cnt++] = string[position++];
+        }
+        parameter[cnt] = 0; //terminate string
+
+        //log_out("Command - %s.\n", command);
+        //log_out("Parameter - %s.\n", parameter);
+        
+        // Read settings
+        if (strcmp(command, "read") == 0) {
+            if (strcmp(parameter, "flash") == 0) {
+                ReadSettingsFromFlash();
+            }
+            else if (strcmp(parameter, "ram") == 0) {
+                ShowSettings();
+            }
+        }
+        // Save settings to FLASH
+        else if (strcmp(command, "save") == 0)
+            SaveSettingsToFlash();
+        
+        // Enter KISS mode
+        else if (strcmp(command, "kiss") == 0) {
+            log_out("Entering KISS mode.\n");
+            log_out("You can exit KISS mode via KISS command <0xC0 0xFF 0xC0>\n");
+            // disable CRLF convertion, so we can write raw data to the USB port in KISS mode
+            stdio_set_translate_crlf(&stdio_usb, false);
+            //fwrite(buf, 1, sizeof(buf), stdout);  // seems not to work
+            //putchar(49);
+
+            Status.KissMode = ON;
+        }
+
+        // Set mycall (cannot be longer than 9 characters)
+        else if (strcmp(command, "mycall") == 0) {
+            if (sizeof(AprsSettings.MyCall) > strlen(parameter)) {
+                position = 0;
+                while( parameter[position] != 0 )
+                {
+                    AprsSettings.MyCall[position] = parameter[position];
+                    position++;
+                }
+                AprsSettings.MyCall[position] = 0;
+                log_out("MyCall set to %s.\n", AprsSettings.MyCall);
+            }
+        }
+        // Set servercall (cannot be longer than 9 characters)
+        else if (strcmp(command, "servercall") == 0) {
+            if (sizeof(AprsSettings.ServerCall) > strlen(parameter)) {
+                position = 0;
+                while( parameter[position] != 0 )
+                {
+                    AprsSettings.ServerCall[position] = parameter[position];
+                    position++;
+                }
+                AprsSettings.ServerCall[position] = 0;
+                log_out("ServerCall set to %s.\n", AprsSettings.ServerCall);
+            }
+        }
+        // Set path 1 (cannot be longer than 9 characters)
+        else if (strcmp(command, "path1") == 0) {
+            // Set path to nothing
+            if (parameter[0] == '0') {
+                AprsSettings.Path1[0] = 0;
+                log_out("Path1 cleared.\n");
+            }
+            else if (sizeof(AprsSettings.Path1) > strlen(parameter)) {
+                position = 0;
+                while( parameter[position] != 0 )
+                {
+                    AprsSettings.Path1[position] = parameter[position];
+                    position++;
+                }
+                AprsSettings.Path1[position] = 0;
+                log_out("Path1 set to %s.\n", AprsSettings.Path1);
+            }
+        }
+        // Set path 2 (cannot be longer than 9 characters)
+        else if (strcmp(command, "path2") == 0) {
+            // Set path to nothing
+            if (parameter[0] == '0') {
+                AprsSettings.Path2[0] = 0;
+                log_out("Path2 cleared.\n");
+            }
+            else if (sizeof(AprsSettings.Path2) > strlen(parameter)) {
+                position = 0;
+                while( parameter[position] != 0 )
+                {
+                    AprsSettings.Path2[position] = parameter[position];
+                    position++;
+                }
+                AprsSettings.Path2[position] = 0;
+                log_out("Path2 set to %s.\n", AprsSettings.Path2);
+            }
+        }
+        // Set destination (cannot be longer than 9 characters)
+        else if (strcmp(command, "dest") == 0) {
+            if (sizeof(AprsSettings.Destination) > strlen(parameter)) {
+                position = 0;
+                while( parameter[position] != 0 )
+                {
+                    AprsSettings.Destination[position] = parameter[position];
+                    position++;
+                }
+                AprsSettings.Destination[position] = 0;
+                log_out("Destination set to %s.\n", AprsSettings.Destination);
+            }
+        }
+        // Set lora frequency (limited between 420MHz and 450MHz)
+        else if (strcmp(command, "freq") == 0) {
+            tmp = ConvertStringToValue(parameter);
+            if (tmp == 0xFFFFFFFF || tmp < 420000000 || tmp > 450000000)
+                log_out("ERROR: that is not a valid value.\n");
+            else {
+                AprsSettings.loraFrequency = tmp;
+                log_out("LoRa frequency set to %u.\n", AprsSettings.loraFrequency);
+            }
+        }
+        // Set lora spreading factor (can be between 6 and 12)
+        else if (strcmp(command, "spread") == 0) {
+            tmp = ConvertStringToValue(parameter);
+            if (tmp == 0xFFFFFFFF || tmp < 6 || tmp > 12)
+                log_out("ERROR: that is not a valid value.\n");
+            else {
+                AprsSettings.loraSpreadingFactor = (uint16_t)tmp;
+                log_out("LoRa spreading factor set to %u.\n", AprsSettings.loraSpreadingFactor);
+            }
+        }
+        // Set lora preamble (can be between 6 and 0xFFFF)
+        else if (strcmp(command, "pre") == 0) {
+            tmp = ConvertStringToValue(parameter);
+            if (tmp == 0xFFFFFFFF || tmp < 6 || tmp > 0xFFFF)
+                log_out("ERROR: that is not a valid value.\n");
+            else {
+                AprsSettings.loraPreamble = (uint16_t)tmp;
+                log_out("LoRa preamble set to %u.\n", AprsSettings.loraPreamble);
+            }
+        }
+        // Set lora coding rate (can be between 5 and 8)
+        else if (strcmp(command, "rate") == 0) {
+            tmp = ConvertStringToValue(parameter);
+            if (tmp == 0xFFFFFFFF || tmp < 5 || tmp > 8)
+                log_out("ERROR: that is not a valid value.\n");
+            else {
+                AprsSettings.loraCodingRate = (uint16_t)tmp;
+                log_out("LoRa coding rate set to %u.\n", AprsSettings.loraCodingRate);
+            }
+        }
+        // Set lora tx power (can be between 2 and 17)
+        else if (strcmp(command, "power") == 0) {
+            tmp = ConvertStringToValue(parameter);
+            if (tmp == 0xFFFFFFFF || tmp < 2 || tmp > 17)
+                log_out("ERROR: that is not a valid value.\n");
+            else {
+                AprsSettings.loraTxPower = (uint16_t)tmp;
+                log_out("LoRa tx power set to %u.\n", AprsSettings.loraTxPower);
+            }
+        }
+        // Set lora bandwidth (can be between 7800 and 500000)
+        else if (strcmp(command, "band") == 0) {
+            tmp = ConvertStringToValue(parameter);
+            if (tmp == 0xFFFFFFFF || tmp < 7800 || tmp > 5000000)
+                log_out("ERROR: that is not a valid value.\n");
+            else {
+                AprsSettings.loraBandwidth = tmp;
+                log_out("LoRa bandwidth set to %u.\n", AprsSettings.loraBandwidth);
+            }
+        }
+        // Set lora pa to +20dBm (can be either 0 or 1)
+        else if (strcmp(command, "pa") == 0) {
+            tmp = ConvertStringToValue(parameter);
+            if (tmp != 0 && tmp != 1)
+                log_out("ERROR: that is not a valid value.\n");
+            else {
+                AprsSettings.loraPaSelect = (uint16_t)tmp;
+                log_out("LoRa PA set to %u.\n", AprsSettings.loraPaSelect);
+            }
+        }
+        // Restart radio
+        else if (strcmp(command, "restart") == 0)
+            if (strcmp(parameter, "lora") == 0) {
+                log_out("Re-");
+                startRadio();
+            }
+
+        else {
+            print_help();
+        }
+    }
+    else
+    {
+        print_help();
+    }
+}
+void ReadUSBSerial(void)
+{
+    static char strg[512];
+    int chr;
+    static int lp = 0;
+    uint16_t tmp;
+    
+    if (Status.KissMode == OFF) {
+        // Read serial port (USB) - non-blocking!
+        chr = getchar_timeout_us(0);
+        while(chr != PICO_ERROR_TIMEOUT)
+        {
+            log_out("%c", chr);
+            
+            strg[lp++] = chr;
+            if(chr == CR || lp == (sizeof(strg) - 1))
+            {
+                strg[lp-1] = 0;	//terminate string by overwriting <CR> with NULL
+                //log_out("You wrote - %s\n", strg);
+                lp = 0;		//reset string buffer pointer
+                log_out("\n");
+                
+                ProcessSerialInput(strg);
+                
+                break;
+            }
+
+            chr = getchar_timeout_us(0);
+        }
+    }
+    // We are in KISS mode
+    else
+    {
+        // Read serial port (USB) - non-blocking!
+        chr = getchar_timeout_us(0);
+        while(chr != PICO_ERROR_TIMEOUT)
+        {
+            strg[lp++] = chr;
+            // Receive buffer buffer full
+            if( lp == (sizeof(strg) - 1)) {
+                lp=0;
+            }
+            // Received FEND (=begin or end frame)
+            if(chr == FEND)
+            {
+                // Valid KISS frame received
+                if (strg[0] == FEND && lp > 1)
+                {
+                    tmp = Kiss.DecodeFrame((uint8_t *) strg, &KissTxFrame);
+                    if ( tmp == 2)
+                    {
+                        //exit KISS MODE
+                        stdio_set_translate_crlf(&stdio_usb, true);
+                        Status.KissMode = OFF; 
+                    }
+                    // Valid KISS data frame, so lets send it
+                    else if (tmp == 0)
+                    {
+                        ComposeAprsFrameFromKiss();
+                    }
+                    lp = 0;		//reset string buffer pointer
+                }
+                // We received a FEND byte,so we are probably between two KISS frames. Let's assume the latest FEND is the beginning of a new frame
+                else
+                {
+                    strg[0] = chr;
+                    lp = 1;         // set string buffer pointer to second position
+                }
+
+                break;
+            }
+
+            chr = getchar_timeout_us(0);
+        }
+    }
+}
+
+int main() {
+    
+    uint16_t ServerCommand = 0;
+    uint16_t TxDelay = 0;
+  
+   setup();
+    
    while (1) {
       int packetSize = LoRa.parsePacket();
       if (packetSize) {
          // received a packet
-         printf("Received packet (RSSI = %idBm)\n",LoRa.packetRssi());
+         log_out("Received packet (RSSI = %idBm)\n",LoRa.packetRssi());
 
          getPacketData(packetSize);
          
@@ -85,10 +530,10 @@ int main() {
                  rxBuffer[cnt-3] = rxBuffer[cnt];
              }
              rxBuffer[packetSize-3] = 0;
-             printf("%s\n", rxBuffer);
+             log_out("%s\n", rxBuffer);
              ServerCommand = decode_packet();
          } else {
-             printf("ERROR: No or corrupted APRS frame.\n");
+             log_out("ERROR: No or corrupted APRS frame.\n");
          }
       }
       
@@ -125,6 +570,10 @@ int main() {
                   
                   break;
                   
+              // Send description digital outputs
+              case 7 :
+                  ComposeAprsFrame(Status.DescriptionString);
+                  
               // Switch off 24V power supply
               case 30 :
                   gpio_put(PowerSupply24VControl, 0);
@@ -191,21 +640,14 @@ int main() {
               TransmitRequest = false;
           }
     }
+    
+    // Read serial input and process it
+    ReadUSBSerial();
   }    
   
   return 0;
 }
 
-/*
- * Load settings from EEPROM
- */
-bool LoadSettings()
-{
-    printf("APRS settings:\n");
-    printf("My call: %s\n", AprsSettings.MyCall);
-    printf("Server call: %s\n", AprsSettings.ServerCall);
-    
-}
 /*
  * Initializes the LoRa module with the parameters set in config.h
  */
@@ -213,29 +655,19 @@ bool startRadio()
 {
   // override the default CS, reset, and IRQ pins (optional)
   // LoRa.setPins(7, 6, 1); // set CS, reset, IRQ pin
-    
+  log_out("Starting LoRa radio");
-  printf("LoRa settings:\n");
+  if (!LoRa.begin(AprsSettings.loraFrequency)) {
-  printf("loraFrequency       = %u\n", loraFrequency);    
+    log_out("  [ FAILED ]\n");
-  printf("loraSpreadingFactor = %i\n", loraSpreadingFactor);    
-  printf("loraPreamble        = %i\n", loraPreamble);    
-  printf("loraCodingRate      = %i\n", loraCodingRate);    
-  printf("loraTxPower         = %i\n", loraTxPower);    
-  printf("LoRaPaSelect        = %i\n", LoRaPaSelect);    
-  printf("loraBandwidth       = %u\n", loraBandwidth);    
-   
-  printf("Starting LoRa radio");
-  if (!LoRa.begin(loraFrequency)) {
-    printf("  [ FAILED ]\n");
     while(1);
   }
   else {
-    LoRa.setPreambleLength(loraPreamble);
+    LoRa.setPreambleLength(AprsSettings.loraPreamble);
-    LoRa.setSignalBandwidth(loraBandwidth);
+    LoRa.setSignalBandwidth(AprsSettings.loraBandwidth);
-    LoRa.setTxPower(loraTxPower,LoRaPaSelect);
+    LoRa.setTxPower(AprsSettings.loraTxPower,AprsSettings.loraPaSelect);
-    LoRa.setSpreadingFactor(loraSpreadingFactor);
+    LoRa.setSpreadingFactor(AprsSettings.loraSpreadingFactor);
-    LoRa.setCodingRate4(loraCodingRate);
+    LoRa.setCodingRate4(AprsSettings.loraCodingRate);
     LoRa.enableCrc();
-    printf("  [ DONE ]\n");
+    log_out("  [ DONE ]\n");
   }
 }
 
@@ -249,59 +681,54 @@ void getPacketData(int packetLength)
   rxBuffer[position] = 0;
 }
 
-/* Encode LoRa APRS frame: extract source call, digipeater path and data field. At the same time, check for data corruption
+/* Decode LoRa APRS frame: extract source call, digipeater path and data field. At the same time, check for data corruption
  * 
  * If frame is a message from the server it returns the command from this server 
+ * 
+ * The resulting fields are stored in struct AprsFrame and given to the kiss-routines for further processing (when in kiss-mode)
  */
 uint16_t decode_packet ()
 {
     int position = 0;
     int cnt = 0;
-    int number_of_digipeaters = 0;
-    char valid_apsr_data = false;
     
-    uint8_t aprs_source_address[10];
+    memset(AprsFrame.source_address, 0, sizeof(AprsFrame.source_address));
-    uint8_t aprs_digi_path[255];
+    memset(AprsFrame.digi_path, 0, sizeof(AprsFrame.digi_path));
-    uint8_t aprs_data_field[255];
+    memset(AprsFrame.data_field, 0, sizeof(AprsFrame.data_field));
-    uint8_t aprs_message[255];
+    memset(AprsFrame.message, 0, sizeof(AprsFrame.message));
-    uint8_t aprs_digis[10][10];
+    memset(AprsFrame.digis, 0, sizeof(AprsFrame.digis));
-    uint8_t aprs_acknowledge_number[255];
+    memset(AprsFrame.acknowledge_number, 0, sizeof(AprsFrame.acknowledge_number));
-    bool aprs_acknowledge_request = false;
+    AprsFrame.acknowledge_request = false;
-    uint16_t aprs_server_command = 0;
+    AprsFrame.server_command = 0;
-    
+    AprsFrame.number_of_digipeaters = 0;
-    memset(aprs_source_address, 0, sizeof(aprs_source_address));
+    AprsFrame.valid_apsr_data = false;
-    memset(aprs_digi_path, 0, sizeof(aprs_digi_path));
-    memset(aprs_data_field, 0, sizeof(aprs_data_field));
-    memset(aprs_message, 0, sizeof(aprs_message));
-    memset(aprs_digis, 0, sizeof(aprs_digis));
-    memset(aprs_acknowledge_number, 0, sizeof(aprs_acknowledge_number));
    
     // Extract from address
     cnt = 0;    
     while( rxBuffer[position] != 0 )
     {
-        aprs_source_address[cnt++] = rxBuffer[position];
+        AprsFrame.source_address[cnt++] = rxBuffer[position];
         if ( rxBuffer[position] == '>' && position < 10 ) {
-            aprs_source_address[cnt-1] = 0;
+            AprsFrame.source_address[cnt-1] = 0;
-            valid_apsr_data = true;
+            AprsFrame.valid_apsr_data = true;
+                position++;
             break;
         }
         position++;
     }
     
-    position++;
+    if (AprsFrame.valid_apsr_data == true)
-    
-    if (valid_apsr_data == true)
     {
         // Extract digi path
-        valid_apsr_data = false;
+        AprsFrame.valid_apsr_data = false;
         cnt = 0;
         while( rxBuffer[position] != 0 )
         {
-            aprs_digi_path[cnt++] = rxBuffer[position];
+            AprsFrame.digi_path[cnt++] = rxBuffer[position];
             if ( rxBuffer[position] == ':' ) {
-                aprs_digi_path[cnt-1] = 0;
+                AprsFrame.digi_path[cnt-1] = 0;
-                valid_apsr_data = true;
+                AprsFrame.valid_apsr_data = true;
+                    position++;
                 break;
             }
             position++;
@@ -309,103 +736,108 @@ uint16_t decode_packet ()
         
     }
 
-    position++;
+    if (AprsFrame.valid_apsr_data == true)
-    
-    if (valid_apsr_data == true)
     {
         // Extract data field
         cnt = 0;
         while( rxBuffer[position] != 0 )
         {
-            aprs_data_field[cnt++] = rxBuffer[position];
+            AprsFrame.data_field[cnt++] = rxBuffer[position];
             position++;
         }
-        aprs_data_field[cnt] = 0;        
+        AprsFrame.data_field[cnt] = 0;        
     }    
     
-    if (valid_apsr_data == true)
+    if (AprsFrame.valid_apsr_data == true)
     {
         // Extract digis from digi-path
         cnt = 0;
         position = 0;
-        number_of_digipeaters = 0;
+        AprsFrame.number_of_digipeaters = 0;
-        while( aprs_digi_path[position] != 0 )
+        while( AprsFrame.digi_path[position] != 0 )
         {
-            aprs_digis[number_of_digipeaters][cnt++] = aprs_digi_path[position];
+            AprsFrame.digis[AprsFrame.number_of_digipeaters][cnt++] = AprsFrame.digi_path[position];
-            if ( aprs_digi_path[position] == ',' && cnt < 10 ) {
+            if ( AprsFrame.digi_path[position] == ',' && cnt < 10 ) {
-                aprs_digis[number_of_digipeaters][cnt-1] = 0;
+                AprsFrame.digis[AprsFrame.number_of_digipeaters][cnt-1] = 0;
-                if (++number_of_digipeaters > 9) {
+                if (++AprsFrame.number_of_digipeaters > 9) {
-                    valid_apsr_data = false;
+                    AprsFrame.valid_apsr_data = false;
                     break;
                 }
-                
-                //position++;
                 cnt = 0;
             }
             position++;
         }
-        aprs_digis[number_of_digipeaters][cnt] = 0;    
+        AprsFrame.digis[AprsFrame.number_of_digipeaters][cnt] = 0;    
     }
     
-    if (valid_apsr_data) {
+    if (AprsFrame.valid_apsr_data) {
         
         // Check if packet comes from our server and if so, check if it is a message for us.
-        if ( !compare_strings(aprs_source_address, AprsSettings.ServerCall) ) {
+        if ( !compare_strings(AprsFrame.source_address, AprsSettings.ServerCall) ) {
 
-            if ( is_message_for_me(aprs_data_field, AprsSettings.MyCall) ) 
+            if ( is_message_for_me(AprsFrame.data_field, AprsSettings.MyCall) ) 
             {
                
                 // Extract aprs message from data field
                 position=11;
-                while( aprs_data_field[position] != 0 )
+                while( AprsFrame.data_field[position] != 0 )
                 {
-                    aprs_message[position-11] = aprs_data_field[position];
+                    AprsFrame.message[position-11] = AprsFrame.data_field[position];
                     position++;
                 }
+                AprsFrame.message[position-11] = 0; // Terminate string
                 
                 // Extract command and acknowledge number (if present)
                 cnt = 0;
                 position = 0;
-                while( aprs_message[position] != 0 )
+                while( AprsFrame.message[position] != 0 )
                 {
-                    if ( aprs_message[position] == '{' ) {
+                    if ( AprsFrame.message[position] == '{' ) {
                         
-                        aprs_acknowledge_number[cnt++] = 'a';
+                        AprsFrame.acknowledge_number[cnt++] = 'a';
-                        aprs_acknowledge_number[cnt++] = 'c';
+                        AprsFrame.acknowledge_number[cnt++] = 'c';
-                        aprs_acknowledge_number[cnt++] = 'k';
+                        AprsFrame.acknowledge_number[cnt++] = 'k';
-                        aprs_acknowledge_request = true;
+                        AprsFrame.acknowledge_request = true;
                     }
                     // Calculate server command
-                    if (!aprs_acknowledge_request) {
+                    if (!AprsFrame.acknowledge_request) {
-                        aprs_server_command = 10*aprs_server_command + aprs_message[position]-48;
+                        AprsFrame.server_command = 10*AprsFrame.server_command + AprsFrame.message[position]-48;
                     }
                     
                     position++;
-                    if (aprs_acknowledge_request) {
+                    if (AprsFrame.acknowledge_request) {
-                        aprs_acknowledge_number[cnt++] = aprs_message[position];
+                        AprsFrame.acknowledge_number[cnt++] = AprsFrame.message[position];
                     }
                 }
-                aprs_acknowledge_number[cnt] = 0;
+                AprsFrame.acknowledge_number[cnt] = 0;
             }
             
         }
         
-        printf("Source address: %s\nDigipeaters (%u): %s %s %s %s\nData: %s\n", aprs_source_address, number_of_digipeaters+1, aprs_digis[0], aprs_digis[1], aprs_digis[2], aprs_digis[3], aprs_data_field);
+        log_out("Source address: %s\nDigipeaters (%u): %s %s %s %s\nData: %s\n", AprsFrame.source_address, AprsFrame.number_of_digipeaters+1, AprsFrame.digis[0], AprsFrame.digis[1], AprsFrame.digis[2], AprsFrame.digis[3], AprsFrame.data_field);
-        if (aprs_message[0])
+        
+        // If in KISS mode the struct AprsFrame is handed over to the KISS encoder
+        if (Status.KissMode == ON) {
+            Kiss.EncodeFrame(&AprsFrame, &AX25Frame);
+            //if (Kiss.DecodeFrame(AX25Frame.encoded_kiss_frame, &KissTxFrame) == 0)
+                //ComposeAprsFrameFromKiss();
+        }
+        
+        if (AprsFrame.message[0])
         {
-            printf("Message from server: %s (command %u)\n", aprs_message, aprs_server_command);
+            log_out("Message from server: %s (command %u)\n", AprsFrame.message, AprsFrame.server_command);
-            if (aprs_acknowledge_request) {
+            if (AprsFrame.acknowledge_request) {
-                ComposeAprsFrame(aprs_acknowledge_number);
+                ComposeAprsFrame(AprsFrame.acknowledge_number);
-                printf("Acknowledge request: %s\n", aprs_acknowledge_number);
+                log_out("Acknowledge request: %s\n", AprsFrame.acknowledge_number);
             }
             
         }
 
     }    
     else
-        printf("Error decoding APRS frame.");
+        log_out("Error decoding APRS frame.");
     
-    return (aprs_server_command);
+    return (AprsFrame.server_command);
 }
 
 /* 
@@ -536,7 +968,62 @@ void ComposeAprsFrame(uint8_t payload[])
     
     // Set variable to indicate a send request
     TransmitRequest = true; 
-    printf("%s\n", txBuffer);
+    log_out("%s\n", txBuffer);
+}
+
+void ComposeAprsFrameFromKiss()
+{
+    uint16_t BufferPosition = 0;
+    uint16_t cnt = 0;
+    uint8_t digi_cnt=0;
+    
+    log_out( "Compose APRS from KISS frame");
+    
+    memset(txBuffer, 0, sizeof(txBuffer));
+    
+    // APRS header
+    txBuffer[BufferPosition++] = '<';
+    txBuffer[BufferPosition++] = 0xff;
+    txBuffer[BufferPosition++] = 0x01;
+    
+    while ( KissTxFrame.source_address[cnt] != 0 && BufferPosition<MTU )
+    {
+        txBuffer[BufferPosition] = KissTxFrame.source_address[cnt];
+        BufferPosition++;
+        cnt++;
+    }
+    txBuffer[BufferPosition++] = '>';
+    
+    digi_cnt=0;
+    while(digi_cnt <= KissTxFrame.number_of_digipeaters) {
+        cnt=0;
+        
+        while ( KissTxFrame.digis[digi_cnt][cnt] != 0 && BufferPosition<MTU )
+        {
+            txBuffer[BufferPosition++] = KissTxFrame.digis[digi_cnt][cnt];
+            cnt++;
+        }
+        txBuffer[BufferPosition++] = ',';
+        digi_cnt++;
+    }
+    
+    // Overwrite last command with colon
+    txBuffer[--BufferPosition] = ':';
+    
+    cnt=0;
+    while ( KissTxFrame.data_field[cnt] != 0 && BufferPosition<MTU )
+    {
+        txBuffer[BufferPosition++] = KissTxFrame.data_field[cnt];
+        cnt++;
+    }
+    
+    // Set variable to indicate a send request
+    TransmitRequest = true; 
+    
+    // Ready for next input KISS frame.
+    KissTxFrame.valid_data = false;
+    
+    log_out("%s\n", txBuffer);
 }
 
 void transmit() {