Added DCD LED for all channels

marcel 2 years ago
parent 1eea07e765
commit 11bca2e5a5
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@ -20,3 +20,8 @@ All notable changes to this project will be documented in this file.
### Fixed
- LoRa APRS header (<\xff\x01) was not added to the payload, due to an indentation fault. Long live Python!
## [0.0.2] - 2022-02-01
### Changed
- Carrier detect not via Direwolf (only ax0), but via script in main loop, so all channles (ax0, ax1 and ax2) have DCD

@ -1 +0,0 @@

@ -1,237 +0,0 @@
# -*- coding: utf-8 -*-
from __future__ import print_function
from threading import Thread
import socket
from KissHelper import SerialParser
from array import array
CRCTAB = array("H",[
def logf(message):
import sys
print(message, file=sys.stderr)
class AXUDPServer(Thread):
'''AXUDP Server to communicate with the digipeater'''
txQueue = None
# host and port as configured in aprx/aprx.conf.lora-aprs < interface > section
def __init__(self, txQueue, localHost="", localPort=10001, remoteHost="", remotePort="20000"):
self.socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
self.socket.bind((localHost, localPort))
self.remotePort=remotePort = str()
self.txQueue = txQueue
def run(self):
while True:
frame = self.socket.recv(RECV_BUFFER_LENGTH)
self.txQueue.put(self.axtostr(frame).encode('utf-8'), block=False)
def __del__(self):
def send(self, data, metadata):
self.sendax(data, (self.remoteHost, self.remotePort), metadata)
def axcall(self, text, pos):
while (pos<l) and (len(a)<6) and ((text[pos]>=ord("0")) and (text[pos]<=ord("9")) or (text[pos]>=ord("A")) and (text[pos]<=ord("Z"))):
while len(a)<6: a+=chr(ord(" ")<<1) #fill with spaces
if (pos<l) and (text[pos]==ord("-")):
if (pos<l) and (text[pos]>=ord("0")) and (text[pos]<=ord("9")):
if (pos<l) and (text[pos]>=ord("0")) and (text[pos]<=ord("9")):
ssid=ssid*10 + text[pos]-ord("0")
if ssid>15: ssid=15
if (pos<l) and (text[pos]==ord("*")):
return a, pos
def udpcrc(self, frame, topos):
for p in range(topos): c = (c >> 8) ^ CRCTAB[(ord(frame[p]) ^ c) & 0xff]
return c
def sendax(self, text, ip, values=False):
a,p=self.axcall(text, 0) #src call
if (p>=len(text)) or (text[p]!=ord(">")):
print("fehler 1")
ax,p=self.axcall(text, p+1) #dest call
while True: #via calls
if p>=len(text):
print("found no end of address")
return #found no end of address
if text[p]==ord(":"): break #end of address field
if text[p]!=ord(","):
print("via path error")
return #via path error
if len(ax)>=70:
print("too many via calls")
return #too many via calls
a,p=self.axcall(text, p+1)
if (ord(ax[hp]) & 0x80)!=0: hbit=hp #store last h-bit
if values:
a="\x01\x30" #axudp v2 start
if 'level' in values.keys():
a+="V"+str(round(v))+" " #axudp v2 append level
if 'quality' in values.keys():
a+="Q"+str(round(v))+" " #axudp v2 append quality
if 'txdel' in values.keys():
a+="T"+str(round(v))+" " #axudp v2 append quality
if 'snr' in values.keys():
a+="S"+str(round(v))+" " #axudp v2 append snr
a+="\x00" #axudp2 end
for i in range(len(ax)):
if (i%7==6) and (i>=20) and (i<hbit): ch|=0x80 #set h-bit on all via calls before
if i+1==len(ax): ch|=1 #set ent of address bit
a+="\x03\xf0" #ui frame pid F0
while p<len(text) and i < 256: #append payload
i+=1 #max 256bytes
#for ch in b: print(hex(ord(ch)))
c=self.udpcrc(a, len(a))
a+=chr(c & 0xff)
for i in range(0,len(a)): sa[i]=ord(a[i])
res=sock.sendto(sa, ip)
## RX:
def callstr(self, b, p):
for i in range(6):
if ch<32: s+="^" #show forbidden ctrl in call
elif ch>32:s+=chr(ch) #call is filled with blanks
ssid=(ord(b[p+6])>>1) & 0x0f
if ssid: s+="-"+str(ssid)
return s
def axtostr(self, axbuf):
for x in axbuf:
if le<2:
return ""
c=self.udpcrc(b, le)
if (b[le]!=chr(c & 0xff)) or (b[le+1]!=chr(c>>8)):
return "" #crc error
if axbuf[0]==1: #axudp v2
while (i<len(axbuf)) and (axbuf[i]!=0): i+=1
while i<len(axbuf):
if le>=18: #2 calls + ctrl + pid + crc
s=self.callstr(b, 7) #src call
s+=">"+self.callstr(b, 0) #destination call
while (((not (ord(b[p-1]) & 1)))) and (p+6<le): #via path
if ord(b[p+6])>=128:
elif hbit: #call before had hbit
s+=","+callstr(b, p)
if hbit: s+="*" #last call had hbit
p+=2 #pid, ctrl
while p<le: #payload may contain ctrl characters
return s
if __name__ == '__main__':
'''Test program'''
import time
from multiprocessing import Queue
TCP_PORT = 10001
# frames to be sent go here
KissQueue = Queue()
server = AXUDPServer(TCP_HOST, TCP_PORT, KissQueue)
while True:
"\xc0\x00\x82\xa0\xa4\xa6@@`\x9e\x8ar\xa8\x96\x90q\x03\xf0!4725.51N/00939.86E[322/002/A=001306 Batt=3.99V\xc0")
data = KissQueue.get()
print("Received KISS frame:" + repr(data))

@ -1,24 +0,0 @@
# 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.
## [0.0.1] - 2022-01-31
### Added
- Lora and TCP settings are now configurable via configuration file RPi-LoRa-KISS-TNC.ini
### Changed
- Better encoding of AX.25 frames: less/no crashes due to corrupted incomming frames
### Deprecated
- Configuration via
### Fixed
- LoRa APRS header (<\xff\x01) was not added to the payload, due to an indentation fault. Long live Python!

@ -1,80 +0,0 @@
# Installation and running the RPi-LoRa-shield with APRX
## Install needed packages
sudo apt install python3 python3-rpi.gpio python3-spidev aprx screen git python3-pil python3-smbus
## Checkout the code
Clone this repository.
## Configuration of APRX
In /etc/aprx.conf:
tcp-device 10001 KISS
callsign NOCALL-4 # callsign defaults to $mycall
tx-ok true # transmitter enable defaults to false
# #telem-to-is true # set to 'false' to disable
## Start the LoRa KISS TNC
python3 &
# Alternative method using the AX.25 stack
This method is more complicated, but also more versitile as not all programs can communicate to a KISS device over TCP.
## Install needed packages
sudo apt install python3 python3-rpi.gpio python3-spidev aprx screen git python3-pil python3-smbus
## Checkout the code
Clone this repository.
## Configuration of APRX
In /etc/aprx.conf
ax25-device $mycall
tx-ok true # transmitter enable defaults to false
# #telem-to-is true # set to 'false' to disable
## Install and configure AX.25 stack
sudo apt install socat libax25 ax25-apps ax25-tools
sudo nano /etc/ax25/axports
ax0 NOCALL-3 9600 255 2 430.775 MHz LoRa
## Start the LoRa KISS TNC
python3 &
## Redirect KISS over TCP to AX.25 device
sudo socat PTY,raw,echo=0,link=/tmp/kisstnc TCP4:
sudo kissattach /tmp/kisstnc ax0

@ -1,280 +0,0 @@
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <>.
# This program provides basic KISS AX.25 APRS frame encoding and decoding.
# Note that only APRS relevant structures are tested. It might not work
# for generic AX.25 frames.
# 11/2019 by Thomas Kottek, OE9TKH
# Inspired by:
# * Python script to decode AX.25 from KISS frames over a serial TNC
# * Sending a raw AX.25 frame with Python
# TODO: remove escapes on decoding
# Changes by PE1RXF
# 2022-01-23: - in encode_address() added correct handling of has_been_repeated flag '*'
# 2022-01-28: - in encode_kiss() and encode_address(): better exeption handling for corrupted or mal-formatted APRS frames
import struct
KISS_FEND = 0xC0 # Frame start/end marker
KISS_FESC = 0xDB # Escape character
KISS_TFEND = 0xDC # If after an escape, means there was an 0xC0 in the source message
KISS_TFESC = 0xDD # If after an escape, means there was an 0xDB in the source message
# Addresses must be 6 bytes plus the SSID byte, each character shifted left by 1
# If it's the final address in the header, set the low bit to 1
# Ignoring command/response for simple example
def encode_address(s, final):
if b"-" not in s:
s = s + b"-0" # default to SSID 0
call, ssid = s.split(b'-')
if len(call) < 6:
call = call + b" "*(6 - len(call)) # pad with spaces
encoded_call = [x << 1 for x in call[0:6]]
encoded_ssid = 0b00000000
# If ssid ends with *, the message has been repeated, so we have to set the 'has_been_repeated' flag and remove the * from the ssid
if ssid[-1] == 42:
# print("Message has been repeated")
ssid = ssid[:-1]
encoded_ssid |= 0b10000000
# If SSID was not pressent (and we added the default -0 to it), the has_been_repeated flag could be at the end of the call, so check that as well
# Also, there is a lot of bad software around (including this code) and ignorance of the specifications (are there any specs for LoRa APRS?), so always check for the has_been_repeated flag
if call[-1] == 42:
call = call[:-1]
encoded_ssid |= 0b10000000
# SSID should now be one or two postions long and contain a number (idealy between 0 and 15).
if len(ssid) == 1 and ssid[0] > 47 and ssid[0] < 58:
encoded_ssid |= (int(ssid) << 1) | 0b01100000 | (0b00000001 if final else 0)
elif len(ssid) == 2 and ssid[0] > 47 and ssid[0] < 58 and ssid[1] > 47 and ssid[2] < 58:
encoded_ssid |= (int(ssid) << 1) | 0b01100000 | (0b00000001 if final else 0)
return None
return encoded_call + [encoded_ssid]
def decode_address(data, cursor):
(a1, a2, a3, a4, a5, a6, a7) = struct.unpack("<BBBBBBB", data[cursor:cursor + 7])
hrr = a7 >> 5
ssid = (a7 >> 1) & 0xf
ext = a7 & 0x1
addr = struct.pack("<BBBBBB", a1 >> 1, a2 >> 1, a3 >> 1, a4 >> 1, a5 >> 1, a6 >> 1)
if ssid != 0:
call = addr.strip() + "-{}".format(ssid).encode()
call = addr
return (call, hrr, ext)
# Encode string from LoRa radio to AX.25 over KISS
# We must make no assumptions as the incomming frame could be carbage.
# So make sure we think of everthing in order to prevent crashes.
# The original code from Thomas Kottek did a good job encoding propper APRS frames.
# But when the frames where not what they should be, the program could crash.
def encode_kiss(frame):
# First check: do we have a semi column (seperator path field and data field)
# Note that we could still be wrong: for example when the field seperator is corrupted and we now find a semi column from, lets say, an internet address in the data field...
if not b":" in frame:
return None
# Split the frame in a path field and a data field
path = frame.split(b":")[0]
data_field = frame[frame.find(b":") + 1:]
# The source address is always followed by a greather than sign, so lets see if its there.
# There is always a change that there is another greather than sign because the frame could be corrupted...
if not b">" in path:
return None
# Split the path into a source address and a digi-path array (because digis should be seperated by commas, but again, corruption....)
src_addr = path.split(b">")[0]
digis = path[path.find(b">") + 1:].split(b",")
# destination address
return_value = encode_address(digis.pop(0).upper(), False)
if return_value is None:
return None
packet = return_value
# source address
return_value = encode_address(src_addr.upper(), len(digis) == 0)
if return_value is None:
return None
packet += return_value
# digipeaters
for digi in digis:
final_addr = digis.index(digi) == len(digis) - 1
return_value = encode_address(digi.upper(), final_addr)
if return_value is None:
return None
packet += return_value
# control field
packet += [0x03] # This is an UI frame
# protocol ID
packet += [0xF0] # No protocol
# information field
packet += frame[frame.find(b":") + 1:]
# Escape the packet in case either KISS_FEND or KISS_FESC ended up in our stream
packet_escaped = []
for x in packet:
if x == KISS_FEND:
packet_escaped += [KISS_FESC, KISS_TFEND]
elif x == KISS_FESC:
packet_escaped += [KISS_FESC, KISS_TFESC]
packet_escaped += [x]
# Build the frame that we will send to Dire Wolf and turn it into a string
kiss_cmd = 0x00 # Two nybbles combined - TNC 0, command 0 (send data)
kiss_frame = [KISS_FEND, kiss_cmd] + packet_escaped + [KISS_FEND]
output = bytearray(kiss_frame)
except ValueError:
print("Invalid value in frame.")
return None
return output
def decode_kiss(frame):
result = b""
pos = 0
if frame[pos] != 0xC0 or frame[len(frame) - 1] != 0xC0:
print(frame[pos], frame[len(frame) - 1])
return None
pos += 1
pos += 1
(dest_addr, dest_hrr, dest_ext) = decode_address(frame, pos)
pos += 7
# print("DST: ", dest_addr)
(src_addr, src_hrr, src_ext) = decode_address(frame, pos)
pos += 7
# print("SRC: ", src_addr)
result += src_addr.strip()
# print(type(result), type(dest_addr.strip()))
result += b">" + dest_addr.strip()
ext = src_ext
while ext == 0:
rpt_addr, rpt_hrr, ext = decode_address(frame, pos)
# print("RPT: ", rpt_addr)
pos += 7
result += b"," + rpt_addr.strip()
result += b":"
# (ctrl,) = struct.unpack("<B", frame[pos])
ctrl = frame[pos]
pos += 1
if (ctrl & 0x3) == 0x3:
#(pid,) = struct.unpack("<B", frame[pos])
pid = frame[pos]
# print("PID="+str(pid))
pos += 1
result += frame[pos:len(frame) - 1]
elif (ctrl & 0x3) == 0x1:
# decode_sframe(ctrl, frame, pos)
return None
elif (ctrl & 0x1) == 0x0:
# decode_iframe(ctrl, frame, pos)
return None
return result
class SerialParser():
'''Simple parser for KISS frames. It handles multiple frames in one packet
and calls the callback function on each frame'''
def __init__(self, frame_cb=None):
self.frame_cb = frame_cb
def reset(self):
self.state = self.STATE_IDLE
self.cur_frame = bytearray()
def parse(self, data):
'''Call parse with a string of one or more characters'''
for c in data:
if self.state == self.STATE_IDLE:
if c == self.KISS_FEND:
self.state = self.STATE_FEND
elif self.state == self.STATE_FEND:
if c == self.KISS_FEND:
self.state = self.STATE_DATA
elif self.state == self.STATE_DATA:
if c == self.KISS_FEND:
# frame complete
if self.frame_cb:
if __name__ == "__main__":
# Playground for testing
# frame = "\xc0\x00\x82\xa0\xa4\xb0dr`\x9e\x8ar\xa8\x96\x90u\x03\xf0!4725.73NR00939.61E&Experimental LoRa iGate\xc0"
frame = "\xc0\x00\x82\xa0\xa4\xa6@@`\x9e\x8ar\xa8\x96\x90q\x03\xf0!4725.51N/00939.86E[322/002/A=001306 Batt=3.99V\xc0"
# print(decode_kiss(frame))
# encoded = encode_kiss("OE9TKH-8>APRS,RELAY,BLA:!4725.51N/00939.86E[322/002/A=001306 Batt=3")
# encoded = encode_kiss("OE9TKH-8>APRS,digi-3,digi-2:!4725.51N/00939.86E[322/002/A=001306 Batt=3")
# print((decode_kiss(encoded)))
# print((decode_kiss("\xc0\x00\x82\xa0\xa4\xa6@@`\x9e\x8ar\xa8\x96\x90t\xae\x92\x88\x8ab@\x03\x03\xf0}OE9GHV-10>APMI06,TCPIP,OE9TKH-10*:@110104z4726.55N/00950.63E&WX3in1 op. Holger U=14.2V,T=8.8C\xc0")))
def newframe(frame):
two_example_frames = "\xc0\x00\x82\xa0\xa4\xa6@@`\x9e\x8ar\xa8\x96\x90u\x03\xf0}SOTA>APZS16,TCPIP,OE9TKH-10*::OE9TKH-8 :<Ass/Ref> <Freq> <Mode> [call] [comment]{7ba\xc0\xc0\x00\x82\xa0\xa4\xa6@@`\x9e\x8ar\xa8\x96\x90u\x03\xf0}SOTA>APZS16,TCPIP,OE9TKH-10*::OE9TKH-8 :/mylast{7bb\xc0\xc0\x00\x82\xa0\xa4\xa6@@`\x9e\x8ar\xa8\x96\x90u\x03\xf0}SOTA>APZS16,TCPIP,OE9TKH-10*::OE9TKH-8 :/last{7bc\xc0\xc0\x00\x82\xa0\xa4\xa6@@`\x9e\x8ar\xa8\x96\x90u\x03\xf0}SOTA>APZS16,TCPIP,OE9TKH-10*::OE9TKH-8 :/time(/zone){7bd\xc0"
sp = SerialParser(newframe)

@ -1,232 +0,0 @@
Version 3, 29 June 2007
Copyright © 2007 Free Software Foundation, Inc. <>
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Nothing in this License shall be construed as excluding or limiting any implied license or other defenses to infringement that may otherwise be available to you under applicable patent law.
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17. Interpretation of Sections 15 and 16.
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How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest possible use to the public, the best way to achieve this is to make it free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest to attach them to the start of each source file to most effectively state the exclusion of warranty; and each file should have at least the “copyright” line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program. If not, see <>.
Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short notice like this when it starts in an interactive mode:
<program> Copyright (C) <year> <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate parts of the General Public License. Of course, your program's commands might be different; for a GUI interface, you would use an “about box”.
You should also get your employer (if you work as a programmer) or school, if any, to sign a “copyright disclaimer” for the program, if necessary. For more information on this, and how to apply and follow the GNU GPL, see <>.
The GNU General Public License does not permit incorporating your program into proprietary programs. If your program is a subroutine library, you may consider it more useful to permit linking proprietary applications with the library. If this is what you want to do, use the GNU Lesser General Public License instead of this License. But first, please read <>.

@ -1,177 +0,0 @@
# -*- coding: utf-8 -*-
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <>.
import sys
from asyncio import QueueEmpty
import traceback
sys.path.insert(0, './pySX127x/')
from pySX127x.SX127x.LoRa import LoRa
from pySX127x.SX127x.constants import *
from pySX127x.SX127x.board_config import BOARD
import time
#import KissHelper
class LoraAprsKissTnc(LoRa):
LORA_APRS_HEADER = b"<\xff\x01"
# APRS data types
queue = None
server = None
# init has LoRa APRS default config settings - might be initialized different when creating object with parameters
def __init__(self, queue, server, frequency=433.775, preamble=8, spreadingFactor=12, bandwidth=BW.BW125,
codingrate=CODING_RATE.CR4_5, appendSignalReport = True, paSelect = 1, MaxoutputPower = 15, outputPower = 15, verbose=False):
# Init SX127x
super(LoraAprsKissTnc, self).__init__(verbose)
self.queue = queue
self.appendSignalReport = appendSignalReport
if bandwidth == 'BW7_8':
bandwidth = BW.BW7_8
elif bandwidth == 'BW10_4':
bandwidth = BW.BW10_4
elif bandwidth == 'BW15_6':
bandwidth = BW.BW15_6
elif bandwidth == 'BW20_8':
bandwidth = BW.BW20_8
elif bandwidth == 'BW31_25':
bandwidth = BW.BW31_25
elif bandwidth == 'BW41_7':
bandwidth = BW.BW41_7
elif bandwidth == 'BW62_5':
bandwidth = BW.BW62_5
elif bandwidth == 'BW125':
bandwidth = BW.BW125
elif bandwidth == 'BW250':
bandwidth = BW.BW250
elif bandwidth == 'BW500':
bandwidth = BW.BW500
bandwidth = BW.BW125
if codingrate == 'CR4_5':
codingrate = CODING_RATE.CR4_5
elif codingrate == 'CR4_6':
codingrate = CODING_RATE.CR4_6
elif codingrate == 'CR4_7':
codingrate = CODING_RATE.CR4_7
elif codingrate == 'CR4_8':
codingrate = CODING_RATE.CR4_8
codingrate = CODING_RATE.CR4_5
self.set_pa_config(paSelect, MaxoutputPower, outputPower)
self.set_dio_mapping([0] * 6)
self.server = server
def startListening(self):
while True:
# only transmit if no signal is detected to avoid collisions
if not self.get_modem_status()["signal_detected"]:
# print("RSSI: %idBm" % lora.get_rssi_value())
# FIXME: Add noise floor measurement for telemetry
if not self.queue.empty():
data = self.queue.get(block=False)
if self.aprs_data_type(data) == self.DATA_TYPE_THIRD_PARTY:
# remove third party thing
data = data[data.find(self.DATA_TYPE_THIRD_PARTY) + 1:]
# Add LoRa-APRS header (original, this was indented one position further, only executed when above if-statement was true. Think it should be executed at all times.
data = self.LORA_APRS_HEADER + data
print("LoRa TX: " + repr(data))
except QueueEmpty:
except KeyboardInterrupt:
def on_rx_done(self):
payload = self.read_payload(nocheck=True)
if not payload:
print("No Payload!")
rssi = self.get_pkt_rssi_value()
snr = self.get_pkt_snr_value()
data = bytes(payload)
print("LoRa RX[%idBm/%idB, %ibytes]: %s" %(rssi, snr, len(data), repr(data)))
flags = self.get_irq_flags()
if any([flags[s] for s in ['crc_error', 'rx_timeout']]):
print("Receive Error, discarding frame.")
# print(self.get_irq_flags())
self.clear_irq_flags(RxDone=1, PayloadCrcError=1, RxTimeout=1) # clear rxdone IRQ flag
if self.server:
# remove LoRa-APRS header if present
if data[0:len(self.LORA_APRS_HEADER)] == self.LORA_APRS_HEADER:
data = data[len(self.LORA_APRS_HEADER):]
if self.appendSignalReport:
# Signal report only for certain frames, not messages!
if self.aprs_data_type(data) in self.DATA_TYPES_POSITION:
data += b" RSSI=%idBm SNR=%idB" % (rssi, snr)
self.server.send(data, {"level":rssi, "snr":snr})
self.clear_irq_flags(RxDone=1) # clear rxdone IRQ flag
# self.set_mode(MODE.CAD)
def on_tx_done(self):
print("TX DONE")
self.clear_irq_flags(TxDone=1) # clear txdone IRQ flag
self.set_dio_mapping([0] * 6)
def transmit(self, data):
self.write_payload([c for c in data])
self.set_dio_mapping([1, 0, 0, 0, 0, 0])
def aprs_data_type(self, lora_aprs_frame):
delimiter_position = lora_aprs_frame.find(b":")
return lora_aprs_frame[delimiter_position + 1]
except IndexError:
return ""

@ -1,16 +0,0 @@
# Raspberry Pi LoRa KISS TNC
This project was originally started by Tom Kottek ( Because the program had some problems dealing with digipeated frames (it crashed when receiving a ssid with the 'has_been_digipeated' flag -*- set), I took on the task of fixing the code for my personal use.
## Software
The software controls the LoRa transceiver connected to the Raspberry´s SPI bus and emulates a KISS TNC over TCP. That makes it possible to use existing software like APRX. It is also possible to attach the KISS interface to the AX.25 stack via socat/kissattach.
## Hardware
I also designed my own (open source) hardware for it: a board holding a Raspberry Pi Zero 2 W, an SX1278 LoRa transceiver and a power supply with on/off button to safely switch on and off the system. The design files can be found on my website: [RPi LoRa_shield](
### To Do
* The program (or the LoRa module) still crashes occasionally. After restarting the program (kissattach/socat/ it all works again. Need to investigate.
* Completely remove in favour of RPi-LoRa-KISS-TNC.ini
* Add raw TCP KISS socket for true AX.25 over KISS

@ -1,33 +0,0 @@
# Settings for LoRa module
# Bandwidth:
# BW7_8
# BW10_4
# BW15_6
# BW20_8
# BW31_25
# BW41_7
# BW62_5
# BW125
# BW250
# BW500
# Coding Rate:
# CR4_5
# CR4_6
# CR4_7
# CR4_8
paSelect = 1
MaxoutputPower = 15
outputPower = 15
# Settings for KISS

@ -1,61 +0,0 @@
# -*- coding: utf-8 -*-
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <>.
# Usage: python3
from queue import Queue
from TCPServer import KissServer
from AXUDPServer import AXUDPServer
import config
from LoraAprsKissTnc import LoraAprsKissTnc
import configparser
# Read configuration file #
parser = configparser.ConfigParser()'RPi-LoRa-KISS-TNC.ini')
config_frequency = float(parser.get('LoRaSettings', 'frequency'))
config_preamble = int(parser.get('LoRaSettings', 'preamble'))
config_spreadingFactor = int(parser.get('LoRaSettings', 'spreadingFactor'))
config_bandwidth = parser.get('LoRaSettings', 'bandwidth')
config_codingrate = parser.get('LoRaSettings', 'codingrate')
config_appendSignalReport = parser.get('LoRaSettings', 'appendSignalReport')
config_paSelect = int(parser.get('LoRaSettings', 'paSelect'))
config_MaxoutputPower = int(parser.get('LoRaSettings', 'MaxoutputPower'))
config_outputPower = int(parser.get('LoRaSettings', 'outputPower'))
config_TCP_HOST = parser.get('KISS', 'TCP_HOST')
config_TCP_PORT_AX25 = int(parser.get('KISS', 'TCP_PORT_AX25'))
config_TCP_PORT_RAW = int(parser.get('KISS', 'TCP_PORT_RAW'))
# TX KISS frames go here (Digipeater -> TNC)
kissQueue = Queue()
# KISSTCP or AXUDP Server for the digipeater to connect
if config.USE_AXUDP:
server = AXUDPServer(kissQueue, config.AXUDP_LOCAL_IP, config.AXUDP_LOCAL_PORT, config.AXUDP_REMOTE_IP, config.AXUDP_REMOTE_PORT)
server = KissServer(kissQueue, config_TCP_HOST, config_TCP_PORT_AX25)
# LoRa transceiver instance
lora = LoraAprsKissTnc(kissQueue, server, frequency=config_frequency, preamble=config_preamble, spreadingFactor=config_spreadingFactor, bandwidth=config_bandwidth,
codingrate=config_codingrate, appendSignalReport=config_appendSignalReport, paSelect = config_paSelect, MaxoutputPower = config_MaxoutputPower, outputPower = config_outputPower,verbose=True)
# this call loops forever inside

@ -1,94 +0,0 @@
# -*- coding: utf-8 -*-
from __future__ import print_function
import sys
from threading import Thread
import socket
from KissHelper import SerialParser
import KissHelper
def logf(message):
print(message, file=sys.stderr)
class KissServer(Thread):
'''TCP Server to be connected by the APRS digipeater'''
txQueue = None
# host and port as configured in aprx/aprx.conf.lora-aprs < interface > section
def __init__(self, txQueue, host="", port=10001):
self.socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
self.socket.bind((host, port))
self.socket.listen(1) = str()
self.txQueue = txQueue
self.connection = None
def run(self):
parser = SerialParser(self.queue_frame)
while True:
self.connection = None
self.connection, client_address = self.socket.accept()
logf("KISS-Server: Connection from %s" % client_address[0])
while True:
data = self.connection.recv(RECV_BUFFER_LENGTH)
if data:
def queue_frame(self, frame):
print("KISS frame:", repr(frame))
decoded_data = KissHelper.decode_kiss(frame)
print("Decoded:", decoded_data)
self.txQueue.put(decoded_data, block=False)
def __del__(self):
def send(self, data, metadata):
encoded_data = KissHelper.encode_kiss(data)
except Exception as e:
print("KISS encoding went wrong (exception while parsing)")
# traceback.print_tb(e.__traceback__)
encoded_data = None
if encoded_data != None:
print("To Server: " + repr(encoded_data))
if self.connection:
print("KISS encoding went wrong")
if __name__ == '__main__':
'''Test program'''
import time
from multiprocessing import Queue
TCP_PORT = 10001
# frames to be sent go here
KissQueue = Queue()
server = KissServer(TCP_HOST, TCP_PORT, KissQueue)
while True:
"\xc0\x00\x82\xa0\xa4\xa6@@`\x9e\x8ar\xa8\x96\x90q\x03\xf0!4725.51N/00939.86E[322/002/A=001306 Batt=3.99V\xc0")
data = KissQueue.get()
print("Received KISS frame:" + repr(data))

@ -1,440 +0,0 @@
# Simple sample configuration file for the APRX-2 -- an APRS iGate and Digipeater
# This configuration is structured with Apache HTTPD style tags
# which then contain subsystem parameters.
# For simple case, you need to adjust 4 things:
# - Mycall parameter
# - passcode parameter in APRS-IS configuration
# - Select correct type of interface (ax25-device or serial-device)
# - Optionally set a beacon telling where this system is
# - Optionally enable digipeater with or without tx-igate
# Define the parameters in following order:
# 1) <aprsis> ** zero or one
# 2) <logging> ** zero or one
# 3) <interface> ** there can be multiple!
# 4) <beacon> ** zero to many
# 5) <telemetry> ** zero to many
# 6) <digipeater> ** zero to many (at most one for each Tx)
# Global macro for simplified callsign definition:
# Usable for 99+% of cases.
mycall N0CALL-1
# Global macro for simplified "my location" definition in
# place of explicit "lat nn lon mm" at beacons. Will also
# give "my location" reference for "filter m/100".
#myloc lat ddmm.mmN lon dddmm.mmE
# The aprsis login parameter:
# Station callsignSSID used for relaying APRS frames into APRS-IS.
# Use this only to define other callsign for APRS\-IS login.
#login OTHERCALL-7 # login defaults to $mycall
# Passcode for your callsign:
# Unique code for your callsign to allow transmitting packets
# into the APRS-IS.
passcode -1
# APRS-IS server name and optional portnumber.
# WARNING: Do not change from default port number [14580]
# unless you are absolutely certain you want
# something else, and you allow that something
# else also affect your tx-igate behaviour!
# Some APRS-IS servers tell every about 20 seconds to all contact
# ports that they are there and alive. Others are just silent.
# Default value is 3*"heartbeat" + some --> 120 (seconds)
#heartbeat-timeout 0 # Disabler of heartbeat timeout
# APRS-IS server may support some filter commands.
# See:
# You can define the filter as single long quoted string, or as
# many short segments with explaining comments following them.
# Usability of these filters for a Tx-iGate is dubious, but
# they exist in case you for example want to Tx-iGate packets
# from some source callsigns in all cases even when they are
# not in your local area.
#filter "possibly multiple filter specs in quotes"
#filter "m/100" # My-Range filter: positions within 100 km from my location
#filter "f/OH2XYZ-3/50" # Friend-Range filter: 50 km of friend's last beacon position
# pidfile is UNIX way to tell that others that this program is
# running with given process-id number. This has compiled-in
# default value of: pidfile /var/run/
pidfile /var/run/
# rflog defines a rotatable file into which all RF-received packets
# are logged. The host system can rotate it at any time without
# need to signal the aprx that the file has been moved.
rflog /var/log/aprx/aprx-rf.log
# aprxlog defines a rotatable file into which most important
# events on APRS-IS connection are logged, namely connects and
# disconnects. The host system can rotate it at any time without
# need to signal the aprx that the file has been moved.