Compile Issue with

[cherbin]

I am trying to send data to thingsboard.cloud.

I've included "ThingsBoard.h" in my .cpp file

I am successfully connected via the THINGSBOARD_SERVER and TOKEN

When I execute the following as a test tb.sendTelemetryInt("temperature", 22);

I get the following compile errors:

sketch\test.cpp.o:(.literal._ZN9test4initEv+0x4c): undefined reference to Telemetry::serializeKeyval(ArduinoJson6185_D1::VariantRef&) const' sketch\test.cpp.o: In function bool ThingsBoardSized<64u, 8u, ThingsBoardDefaultLogger>::sendKeyval(char const*, int, bool)': E:\test.cpp:635: undefined reference to `Telemetry::serializeKeyval(ArduinoJson6185_D1::VariantRef&) const'

Can you please tell me what is wrong..

I eventually want to send a JSON string

Thanks

Also I have tried this:

const int data_items = 2; Telemetry data[data_items] = { { "temperature", 42.2 }, { "humidity", 80 }, };

tb.sendTelemetry(data, data_items);

and get compile issues: undefined reference to Telemetry::serializeKeyval(ArduinoJson6185_D1::VariantRef&) const' In function ThingsBoardSized<64u, 8u, ThingsBoardDefaultLogger>::sendDataArray(Telemetry const*, unsigned int, bool)': undefined reference to Telemetry::serializeKeyval(ArduinoJson6185_D1::VariantRef&) const' undefined reference to Telemetry::serializeKeyval(ArduinoJson6185_D1::VariantRef&) const'