signalk-to-stalk

Signal K Node server plugin to convert Signal K to STALK (Seatalk over NMEA 0183). See the code for a list of supported datagrams.

It is needed to activate the plugin and the relevant data handlers in the server's Admin interface to use the plugin. The conversion results (STALK) will be available on Signalk's built-in TCP NMEA 0183 server (Port 10110).

As the plugin automatically sends STALK data to Signalk's built-in TCP NMEA 0183 server, it is possible to have access to the NMEA 0183 strings without configuring anything (Aka a serial output device) by connecting to port 10110 with a TCP client.

Suppose to output the conversion result into a serial connection (i.e., Digital Yacht's ST2USB or ST2NMEA0183 interfaces). In that case, it is needed to configure the serial connection in the server's Admin interface and add an extra line to the settings.json, specifying that the serial connection should output the plugin's output:

{
  "pipedProviders": [
    {
      "pipeElements": [
        {
          "type": "providers/simple",
          "options": {
            "logging": false,
            "type": "NMEA0183",
            "subOptions": {
              "validateChecksum": true,
              "type": "serial",
              "suppress0183event": true,
              "sentenceEvent": "stalkdata",
              "providerId": "a",
              "device": "/dev/ttyExample",
              "baudrate": 4800,
              "toStdout": "stalkout"          <------------ ADD THIS LINE
            },
            "providerId": "a"
          }
        }
      ],
      "id": "st2usb",
      "enabled": true
    }
  ],
  "interfaces": {}
}

Note: Internally the plugin emits the converted NMEA 0183 messages as Events under the event identifier stalkout. The above configuration sends the converted data (SeaTalk over NMEA 0183) under the stalkout events identifier to the serialport's output.

Note: If you are using the Digital Yacht's SeaTalk1 to NMEA0183 or SeaTalk to USB interfaces, you must setup the STALK mode and 38400 baud connection speed.