4.4 AT+CSCS–Setting the TE Character Set ................................................................................. 44
4.5 AT+CNMI–Setting SMS Indication Mode .................................................................................. 45
4.6 AT+CMGR–Reading SMS Messages ....................................................................................... 47
4.7 AT+CMGL – SMS Message List ................................................................................................ 50
4.8 AT+CMGS – Sending SMS Messages ...................................................................................... 54
4.9 AT+CMGW – Writing SMS Messages ....................................................................................... 55
4.10 AT+CMSS – Sending Messages from Storage ....................................................................... 56
4.11 AT+CMGD – Deleting SMS Messages .................................................................................... 57
4.12 AT+CSCA – Setting SMS Center Number .............................................................................. 58
4.13 AT+CSMP – Setting Text Mode Parameters ........................................................................... 59
4.14 AT+CSDH – Displaying the Parameters of the Text Mode ...................................................... 60
5 TCP/UDP Client Commands ................................................................... 62
5.1 AT+NETAPN–Setting Network APN ......................................................................................... 62
5.2 AT+XIIC–Setting Up a PPP Link ............................................................................................... 63
5.3 AT+TCPSETUP–Setting Up TCP Connection .......................................................................... 64
5.4 AT+TCPSEND–Sending TCP Data .......................................................................................... 65
5.5 AT+RECVMODE–Setting Receive Mode ................................................................................. 66
5.6 AT+TCPRECV–Unsolicited TCP Data Output .......................................................................... 68
5.7 AT+TCPREAD–Reading TCP Data .......................................................................................... 68
5.8 AT+TCPCLOSE–Closing TCP Connection .............................................................................. 69
5.9 AT+UDPSETUP–Setting Up UDP Connection ......................................................................... 70
5.10 AT+UDPSEND–Sending UDP Data ....................................................................................... 71
5.11 AT+UDPRECV–Unsolicited UDP Data Ouput ........................................................................ 73
5.12 AT+UDPREAD–Reading UDP Data ....................................................................................... 73
5.13 AT+UDPCLOSE–Closing UDP Connection ............................................................................ 74
5.14 AT+IPSTATUS–Querying TCP/UDP Socket Status ................................................................ 75
5.15 AT+TCPACK–Querying Status of Data Sent by TCP Socket ................................................. 76
5.16 AT+DNSSERVER–Setting DNS Server ................................................................................. 77
5.17 AT+PDPKEEPALIVE–Setting PDP Keepalive Heartbeat ....................................................... 78
5.18 AT+PDPSTATUS–Querying PDP Status ................................................................................ 79
5.19 AT+TCPKEEPALIVE–Setting TCP Keepalive Heartbeat ......................................................... 80
6 TCP Server Commands ........................................................................... 82
6.1 AT+TCPLISTEN–Setting TCP Listening for the Server ............................................................ 82
6.2 AT+CLOSELISTEN–Closing Socket Connection ..................................................................... 83
6.3 AT+CLOSECLIENT–Closing Remote Socket ........................................................................... 84
6.4 AT+TCPRECV(S)–Unsolicited TCP Data Output ..................................................................... 84
6.5 AT+TCPREADS–Reading TCP Data ........................................................................................ 85
6.6 AT+TCPSENDS–Sending Data to Client .................................................................................. 86
6.7 AT+CLIENTSTATUS–Querying Client Connection Status ....................................................... 87
6.8 AT+TCPACK–Querying Status of Data Sent by TCP Server ................................................... 88
7 Transparent TCP/UDP Commands ......................................................... 90
7.1 AT+TCPTRANS–Setting Up Transparent TCP Connection ..................................................... 90
7.2 AT+UDPTRANS–Setting Up Transparent UDP Connection .................................................... 91