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16.3 Setting MQTT Parameters: +IMQTTPARA ............................................................................ 105
16.4 Setting up MQTT Connection: +IMQTTCONN ....................................................................... 105
16.5 Publishing a Message: +IMQTTPUB ..................................................................................... 106
16.6 Subscribing a Message: +IMQTTSUB ................................................................................... 107
16.7 Unsubscribing a Message: +IMQTTUNSUB .......................................................................... 108
16.8 Receiving Publish Message: +IMQTTRCVPUB .................................................................... 108
16.9 Querying MQTT Connection Status: +IMQTTSTATE ............................................................ 109
16.10 Disconnecting to the MQTT Server: +IMQTTCONN ............................................................. 110
17 File System Commands ....................................................................... 111
17.1 Writing Data to File: +FSWF ................................................................................................... 111
17.2 Reading Data from File: FSRF ................................................................................................ 112
17.3 Obtain the Size of a File: +FSFS ............................................................................................ 113
17.4 Deleting a File: +FSDF ............................................................................................................ 113
18 Standard Extended AT Commands ..................................................... 114
18.1 Shutting Down the Module: +CPWROFF ............................................................................... 114
18.2 Updating Time:+UPDATETIME ............................................................................................... 114
18.3 Querying the IP Address: +DNS ............................................................................................. 117
18.4 Ping Function: +PING ............................................................................................................. 117
18.5 Obtaining the Location of the Module: +CIPGSMLOC ........................................................... 119
18.6 Updating BS Time: +GLTS ..................................................................................................... 120
A Reference Process of AT Command Programming ............................... 122
A.1 Content of PDU SMS Messages ............................................................................................. 122
A.2 Flowchart of Sending Text SMS Messages (Through UART) ................................................. 124
A.3 Flowchart of Sending PDU SMS Messages (Through UART) ................................................ 125
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