NMEA 2000 output from SensESP

n2k_example.cpp

  // wire up a DS18B20 (OneWire device)

  DallasTemperatureSensors* dts = new DallasTemperatureSensors(ONEWIRE_DQ_PIN);

  uint onewire_read_delay = 500;

  auto* onewire_temp =
      new OneWireTemperature(dts, onewire_read_delay, "/temperature/oneWire");

  onewire_temp->connect_to(
      new SKOutputNumber("onewire.temperature", "/temperature/skPath"));

  // output the temperatures read by DS18B20 also on NMEA 2000

  // Reserve enough buffer for sending all messages. This does not work on small
  // memory devices like Uno or Mega
  NMEA2000.SetN2kCANSendFrameBufSize(250);
  // Set Product information
  NMEA2000.SetProductInformation(
      "20200112",              // Manufacturer's Model serial code
      101,                     // Manufacturer's product code
      "SH-ESP32 Sender",       // Manufacturer's Model ID
      "0.1.0.1 (2020-01-12)",  // Manufacturer's Software version code
      "0.0.2.0 (2020-01-12)"   // Manufacturer's Model version
  );
  // Set device information
  NMEA2000.SetDeviceInformation(
      1,    // Unique number. Use e.g. Serial number.
      132,  // Device function=Analog to NMEA 2000 Gateway. See codes on
            // http://www.nmea.org/Assets/20120726%20nmea%202000%20class%20&%20function%20codes%20v%202.00.pdf
      25,   // Device class=Inter/Intranetwork Device. See codes on
           // http://www.nmea.org/Assets/20120726%20nmea%202000%20class%20&%20function%20codes%20v%202.00.pdf
      2046  // Just choosen free from code list on
            // http://www.nmea.org/Assets/20121020%20nmea%202000%20registration%20list.pdf
  );

  NMEA2000.SetMode(tNMEA2000::N2km_NodeOnly, 22);
  NMEA2000.EnableForward(false);  // Disable all msg forwarding to USB (=Serial)
  NMEA2000.Open();

  // No need to parse the messages at every single loop iteration; 1 ms will do
  app.onRepeat(1, []() { NMEA2000.ParseMessages(); });

  auto* can_output = new LambdaConsumer<float>([](float input) -> void {
    tN2kMsg N2kMsg;
    SetN2kTemperatureExt(N2kMsg, 1, 1, N2kts_MainCabinTemperature, input,
                         input);
    NMEA2000.SendMsg(N2kMsg);
  });

  // connect the temperature input to N2K output

  onewire_temp->connect_to(can_output);