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start_tx_systemd.sh
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start_tx_systemd.sh
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#!/bin/bash
#
# Wenet TX-side Initialisation Script - Systemd Unit Version
# 2024-07-21 Mark Jessop <[email protected]>
#
# Run this to set up an attached RFM22B/RFM98W and start transmitting!
# Replace the transmit frequency and callsign with your own.
#
# A callsign which will be included in the Wenet Packets.
# This MUST be <= 6 characters long.
MYCALL=VK5ARG
# The centre frequency of the Wenet transmission.
TXFREQ=443.500
# Baud Rate
# Known working transmit baud rates are 115200 (the preferred default).
# Lower baud rates *may* work, but will need a lot of testing on the receiver
# chain to be sure they perform correctly.
BAUDRATE=115200
# GPS Port
# Note that we only support uBlox GPS units
GPSPORT=/dev/ttyACM0
# CHANGE THE FOLLOWING LINE TO REFLECT THE ACTUAL PATH TO THE TX FOLDER.
# i.e. it may be /home/username/dev/wenet/tx/
cd /home/pi/wenet/tx/
# Wait here until the SPI devices are available.
# This can take a few tens of seconds after boot.
timeout=20
while : ; do
[[ -e "/dev/spidev0.0" ]] && break
if [ "$timeout" == 0 ]; then
echo "Did not find SPI device in timeout period!"
exit 1
# At this point this script exits, and systemd should restart us anyway.
fi
echo "Waiting another 2 seconds for SPI to be available."
sleep 2
((timeout--))
done
echo "Waiting another 10 seconds before startup."
sleep 10
#Uncomment to initialise a RFM22B (untested with Python 3)
#python init_rfm22b.py $TXFREQ
# Uncomment for use with a RFM98W
python3 init_rfm98w.py --frequency $TXFREQ --baudrate $BAUDRATE
# Start the main TX Script.
# Do not add a & on the end of these lines when running via systemd!
# Note that you can also add --logo /path/to/logo.png to this to add a logo overlay.
# If using a Picam HQ, add a --picamhq argument into this line before the --gps argument
python3 tx_picam_gps.py --baudrate $BAUDRATE --gps $GPSPORT $MYCALL
# If you don't want any GPS overlays, you can comment the above line and run:
# python WenetPiCam.py --baudrate $BAUDRATE $MYCALL