I have sent messages from device to Azure IoT Hub using MQTT client (like mosquitto). But I want to add custom properties to these messages like the standard SDK of Microsoft.
Is there any suggestion for that?
Any idea will be really appreciated. Thanks in advance

The solution could be found in
Sending device-to-cloud messages
https://learn.microsoft.com/en-us/azure/iot-hub/iot-hub-mqtt-support
Thank @Roman for your suggestion