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RPi-LoRa-KISS-TNC
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Documentation updated for personal hardware

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marcel 2 years ago
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  1. 59
      INSTALL.md
  2. 28
      README.md

59
INSTALL.md
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# Installation and running the RPi-LoRa-Gateway
# Installation and running the RPi-LoRa-shield with APRX
## Install needed packages
`
@ -6,63 +6,12 @@ sudo apt install python3 python3-rpi.gpio python3-spidev aprx screen git python3
`
## Checkout the code
Enter following commands:<br/>
```
cd
git clone https://github.com/tomelec/RPi-LoRa-KISS-TNC.git
cd RPi-LoRa-KISS-TNC
git clone https://github.com/mayeranalytics/pySX127x.git
```
to change into homedirectory and then checkout the code and the LoRa Chip-Driver in the right directory.
## Configuration
Afterwards configure as following:
### Edit aprx/aprx.conf.lora-aprs file
Type:
```
cd
cd RPi-LoRa-KISS-TNC
sudo cp aprx/aprx.conf.lora-aprs /etc/aprx.conf
pico -w /etc/aprx.conf
```
to copy and then open the config file.
The most important settings are:
* **mycall**<br/>
Your call with an apropriate SSID suffix<br/>[Paper on SSID's from aprs.org](http://www.aprs.org/aprs11/SSIDs.txt)
* **myloc**<br/>
NMEA lat/lon form:
```
lat ddmm.mmN lon dddmm.mmE
```
Example:
```
lat 4812.52N lon 01622.39E
```
(simplest way to find the right coordinats for this? Go to [aprs.fi](http://www.aprs.fi) on your location right-click and choose "Add marker" then click on the marker and you should see your coordinates in the NMEA style - enter this infos without any symbols into the config file as seen in the example above)
* **passcode**<br/>
see [see here to generate appropiate setting](https://apps.magicbug.co.uk/passcode/)
* **server**<br/>
either leave the default server or if you're connected to Hamnet as well insert an APRSIS Server within the hamnet - a List of Aprs Hamnet servers can be found in the [OEVSV Wiki](http://wiki.oevsv.at/index.php/Anwendungen_am_HAMNET#APRS_Server))
Clone this repository.
## Configuration
to save and close the file do:
`Strg + x` -> Y -> Enter
### Edit driver config file
Type
```
pico -w pySX127x/SX127x/board_config.py
```
change in line 36
from
```
DIO0 = 22 # RaspPi GPIO 22
DIO0 = 5 # RaspPi GPIO 5
```
to fix the SPI connection #todo how can we config this from outside?
Edit /etc/aprx.conf according to example in aprx/aprx.conf.lora-aprs
## Start the LoRa KISS TNC and aprx server instance
```

28
README.md
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# Raspberry Pi LoRa KISS TNC
This project emulates a KISS TNC and controls a hardware LoRa transceiver
connected to the Raspberry´s SPI. That makes it possible to use existing
software, like digipeaters, with LoRa radio communication. The KISS TNC is
accessed via its TCP server.
The current application is to run the KISS TNC together with the APRS digi [APRX](https://github.com/PhirePhly/aprx), which connects via TCP and provides
powerful APRS digipeating and I-gate functionality for LoRa-APRS.
This project was originally started by Tom Kottek (https://github.com/tomelec/RPi-LoRa-KISS-TNC). 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.
## Hardware
The LoRa KISS TNC runs on Raspberry Pi 2 or newer together with the
*LoRa APRS Gateway Hat V2.0*. However, RFM98W oder RFM96W LoRa modules can
be wired up to the Raspberry Pi directly aswell. See the
[schematic](doc/LoRaAPRS-GW-RPI_V20_Schematic.pdf) for details.
![Gateway on RPi](doc/images/LoRa-APRS_Gateway_V20.jpg)
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](https://meezenest.nl/mees/RPi_LoRa_shield.html)
## Development
## Software
This program and documentation is in a very early state and very experimental.
Only the LoRa radio modem of the gateway board is supported at the moment.
Display and buttons are not working.
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.
### To Do
* Python 3 compatibility
* Get display and buttons working
* Noise floor telemetry
* Installation guide and documentation
* Proper configuration file
* ...
* A lot

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