MQTT code not portable

Do i understand this right that this code is bound to the tcp* and net* functions which are meant for bare metal builds?

https://github.com/Oryx-Embedded/CycloneTCP/blob/1976f5905ef6817c2e8a60b10b04729e205ebae9/mqtt/mqtt_client_transport.c#L621C17-L621C17

this makes it hard to run on posix or win32 builds
