SeaTalk 1 to NMEA0183/2000 with Raspberry Pi

[MatsA]

Is there a way for this program to use input other than GPIO? My SeaTalk to NMEA 0183 converter sends out NMEA strings, but is also sends $STALK strings. Can SignalK use those?

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Sorry to ask the same question twice, I'm just not seeing the evidence that this is happening. Is the talker ID "ST" for these keys?

Signalk should decode STALK messages, just tried a few examples from here though depth units looked odd>
https://github.com/SignalK/signalk-parse...est/ALK.js

Send as UDP from node-red to a signalk UDP connection.

Tye depth & STW I tried showed up in opencpn dashboard via signalk, though the logbook seems to still need NMEA

Nice method checking ! 
And, @abarrow, if Your converter sends out, ST1 sentences, matching the format in the test code above, it will work with the standard SK NMEA0183 parser.