sketch.c

    SensorReport message = SensorReport_init_zero;
    pb_ostream_t stream = pb_ostream_from_buffer(buffer, sizeof(buffer));

    message.device_id = 1;
    message.sensor_id = (uint32_t)2; 
    message.which_value = SensorReport_f_tag;
    message.value.f = currTemp;
    status = pb_encode(&stream, SensorReport_fields, &message);
    message_length = stream.bytes_written;
    if (!status) {
        USE_SERIAL.printf("Encoding failed: %s\n", PB_GET_ERROR(&stream));
    } else {
      USE_SERIAL.print("Message encoded, length: ");
      USE_SERIAL.println(message_length);
      UDP.beginPacket(udpHost, udpPort);
      UDP.write(buffer, message_length);
      UDP.endPacket();
      recvPacket();