Soil moisture & temperature & ec sensor

Hello
I have an Soil Moisture & EC Sensor.
on the tag it states its an uart model.
I searched but can not find a way to communicate with the sensor.
Any ideas?
i know there is a modbus variant of this but this one clearly states uart.
it came in combination with an dragino lora modem.

made some pretty pictures of the sensor:

Thanks for any help.

Vossie