MbedClient: improving logic of readSocket #1089

Job	Run time
compile-examples (arduino:mbed:nano33ble)	7m 32s
compile-examples (arduino:mbed:envie_m7)	16m 18s
compile-examples (arduino:mbed:nanorp2040connect)	12m 52s
compile-examples (arduino:mbed:nicla_sense)	7m 41s
compile-examples (arduino:mbed:nicla_vision)	12m 34s
compile-examples (arduino:mbed:opta)	15m 53s
compile-examples (arduino:mbed:giga)	25m 34s
compile-examples (arduino:mbed:nicla_voice)	5m 38s
compile-examples (arduino:mbed:edge_control)	5m 51s
compile-examples (arduino:mbed:envie_m7:target_core=cm4, - libraries/KernelDebug - libraries/Port...	4m 31s
	1h 54m 24s

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