UART TCP Connection Help

I am trying to connect to my device an older WiiMu A01 to send MCU commands over TCP.
a Command for example is MCU+PAS+MODE+STOP&, it works correctly with the uart_passthrough_test application but I am unable to get this working via a direct TCP request when testing with netcat. Any help is appreciated.

The http api requests in the documentation here work, but there is no refences on how to use the UART passthrough.

I’ve update the TCP API and you could check it out.