5.9 AT+CMGW–Writing an SMS Message ..................................................................................... 51
5.10 AT+CMSS–Sending a Message in the Memory ..................................................................... 52
5.11 AT+CMGD–Deleting the SMS Message ................................................................................. 53
5.12 AT+CSCA–Setting SMS Center Number ................................................................................ 54
5.13 AT+CSMP–Setting Text Mode Parameters ............................................................................ 55
5.14 AT+CSDH–Displaying the Parameters of the Text Mode ....................................................... 56
5.15 AT+CSAS–Save Settings ....................................................................................................... 58
5.16 AT+SMSWHITELIST–Setting the SMS Whitelist ................................................................... 58
6 Network Service ...................................................................................... 60
6.1 AT+CSQ–Querying Signal Quality ............................................................................................ 60
6.2 AT+COPS – Selecting and Registering With a Network ........................................................... 61
6.3 AT+NETSTATE–Querying the Network State ........................................................................... 63
6.4 AT+CELLINFO–Querying Cell Information ............................................................................... 64
6.5 AT+NETINFO–Querying the Network Information.................................................................... 65
6.6 AT+NETCFG–Setting the Network Mode ................................................................................. 66
6.7 AT+NVSETBAND–Setting Frequency Band ............................................................................. 67
6.8 AT+NETSRVDOMAIN–Setting the Network Service Domain .................................................. 68
7 EPS Commands ...................................................................................... 70
7.1 AT+CGDCONT–Defining PDP Context .................................................................................... 70
7.2 AT+XIIC–Setting Up a PPP Link ............................................................................................... 71
7.3 AT+CGATT–Attaching and Detaching to PS ............................................................................ 72
7.4 AT+CGAUTH–PDP Authentication ........................................................................................... 73
8 TCP/UDP Client Commands ................................................................... 75
8.1 AT+RECVMODE–Setting the Receive Mode ........................................................................... 75
8.2 AT+TCPKEEPALIVE–Setting Keepalive Heartbeat .................................................................. 76
8.3 AT+TCPSETUP–Setting Up a TCP Connection ....................................................................... 77
8.4 AT+TCPSEND–Sending TCP Data .......................................................................................... 78
8.5 AT+TCPRECV–Unsolicited TCP Data Output .......................................................................... 80
8.6 AT+TCPREAD–Reading TCP Data .......................................................................................... 80
8.7 AT+TCPCLOSE–Closing TCP Connection .............................................................................. 81
8.8 AT+UDPSETUP–Setting Up UDP Connection ......................................................................... 82
8.9 AT+UDPSEND–Sending UDP Data ......................................................................................... 83
8.10 AT+UDPRECV–Unsolicited UDP Data Ouput ........................................................................ 84
8.11 AT+UDPREAD–Reading UDP Data ....................................................................................... 85
8.12 AT+UDPCLOSE–Closing the UDP Connection ...................................................................... 86
8.13 AT+IPSTATUS–Querying TCP/UDP Socket Status ................................................................ 87
8.14 AT+TCPACK–Querying Status of Data Transmitted by TCP Socket ..................................... 88
9 Transparent TCP/UDP Commands ......................................................... 89
9.1 AT+TCPTRANS–Setting Up a Transparent TCP Connection .................................................. 89
9.2 AT+UDPTRANS–Setting Up a Transparent UDP Connection ................................................. 90
9.3 AT+IPSTATUS–Querying TCP/UDP Socket Status .................................................................. 91
9.4 AT+TRANSCLOSE–Closing the Transparent Socket .............................................................. 92