Hi,
Thanks you for the reply. I managed to send data to TB (Thingsboard). It is good.
TBs MQTT broker has subscribe topic "v1/devices/me/attributes". If value updated in TB, it immediately sends a JSON message to this subscribe topic like this {"RegistrName":0.485}. This "RegistrName" is the name assigned TB. According to the articles mentioned doesn't describe something like that. They just send binary ModBus data packet processed in the server into the device over MQTT. TB doesn't support something like that.
Is there any way to configure the device, write a value into ModBus register after receiving JSON msg with ModBus Register name and its value?
Thanks.