QuectelBC20modulefeaturesembeddedTCP/IPstack,whichenablesthehosttoaccesstheInternetdirectlyoverATcommands.ThisgreatlyreducesthedependenceonPPPandTCP/IPprotocolstacksandthusminimizesthecost.QuectelBC20moduleprovidesthefollowingsocketservices:TCPclientandUDPclient.