MQTT协议MQTT3.11

MQTTisaClientServerpublish/subscribemessagingtransportprotocol.Itislightweight,open,simple,anddesignedsoastobeeasytoimplement.Thesecharacteristicsmakeitidealforuseinmanysituations,includingconstrainedenvironmentssuchasforcommunicationinMachinetoMachine(M2M)andInternetofThings(IoT)co