Seatalk1 into signalk over UDP...how?

[jimseng]

Hello. As the Pi 5 can't read the Seatalk 1 bus at the moment I was wondering if I could add a seatalk data connection that receives it via UDP from my other Pi 4 on the boat. I have been using the Pi 4 to read seatalk and send it to my phone via bluetooth for ages but since adding a Pi 5 as a plotter I would like to receive it into Signalk over the network from my Pi 4. The bit I can't find is where is the seatalk script for reading from the gpio in SignalK? I thought maybe I could work out how to tweak it so instead of reading from GPIO I could read from a UDP socket into signalk. I have got as far as successfully receiving seatalk datagrans via UDP into my Pi 5 using nc on the command line (the Pi 5 is dunning signalK) I just cannot find where to look for the scritp that reads from GPIO.:
Pi 5 command line:
nc -u 192.168.1.10 -l -p 4041
$STALK,84,46,03,00,40,00,00,00,06
$STALK,10,01,00,2f
$STALK,11,01,0e,09
$STALK,20,01,00,00
$STALK,23,01,13,42
$STALK,00,02,60,03,01
$STALK,26,04,00,00,4c,00,04
$STALK,27,01,26,01
$STALK,9c,41,03,00
$STALK,84,46,03,00,40,00,00,00,06
$STALK,99,00,00
$STALK,10,01,00,2d
$STALK,11,01,0e,04
Any help would be appreciated

[tkurki]

Seatalk as STALK strings is handled like NMEA 0183 data - i think all you need to do is add a connection for NMEA 0183 type data with UDP source.

[jimseng]

Great, thanks tkurki. That was easy. So this leads me to think there might be a fairly low cost way of getting seatalk 1 into SignalK running on a Pi 5, perhaps using a Pi PicoW or Pi Zero. I might look at the Pico route as the cheapest as it has been bugging me since setting up my plotter on a Pi 5. I just happen to have a Pi 4 already but I'd like to migrate all the functions over to the Pi 5 eventually, it has been the seatalk bit that has stopped me. This gets me one step closer.