When i use the library and send message to IoT_hub the custom body is Base64 encoded when i use a message route to Cosmos DB. Is it possible to add system properties to the azure object?

I see people adding the Content-Type and Content-Encoding utf-8 would solve the issue...

azure = IoT_Hub(connection_string='HostName=<my iothub>.azure-devices.net;DeviceId=myCore2;SharedAccessKey=< right>')
azure.start()

azure.publish_D2C_message(msgJSON)