Fixed LoRa-Shield recv invalid #42

Job	Run time
build (examples/UnitTestExample)	57s
build (examples/ETHOTA)	52s
build (examples/HelloServer)	59s
build (examples/MQTTClient)	52s
build (examples/ESPMQTTSClient)	52s
build (examples/StaticIPAddress)	57s
build (examples/UDPClientReceiver)	55s
build (examples/UDPClientSender)	54s
build (examples/UDPClientReceiverDirectPC)	56s
build (examples/UDPClientSenderDirectPC)	1m 2s
build (examples/AsyncUDPServer)	52s
build (examples/AsyncUDPClient)	51s
build (examples/WebSocketClient)	59s
build (examples/WebSocketServer)	58s
build (examples/TCPClient)	56s
build (examples/TCPServer)	55s
build (examples/RS485_Master)	44s
build (examples/RS485_Slave)	53s
build (examples/RS485_ModBUS)	53s
build (examples/TFT_ILI9341_Shield)	57s
build (examples/SPI_Wire_DevicesExample)	1m 8s
build (examples/WireExample)	44s
	20m 6s

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