Multitech MMCModem GPRS (MTMMC-G) Manual de usuario descargar pdf (Pagina 15)

Chapter 3 – IP Protocol Services

Multi-Tech Systems, Inc. IP Connectivity AT Commands for GPRS-F4 Wireless Modems (PN S000437C) 15

Chapter 3 – IP Protocol Services

Service Creation +WIPCREATE

Description: The +WIPCREATE command is used to create UDP, TCP client and TCP server

sockets associated with the specified index and FTP service. Only one FTP

session at a time is available.

If a local port is specified while creating a socket, the created socket will be

assigned to this port; if not, a port will be assigned dynamically by WIP application.

If peer IP and peer port is specified, the created socket will be connected to the

specified IP and port.

TCP server cannot be used to transfer data. To transfer data, it creates a local TCP

client socket. This process of creating local socket is referred as “spawning”. When

a server socket is created using, socket passively listens on a specified port for

incoming connections. The below mentioned diagram shows different states

managed for TCP server.

On reception of a connection request from a remote client socket, a server socket

does the following:

• Spawns a new socket (client) to connect to the remote socket

• Data transfer is done between the spawned socket and the remote socket

• Server socket remains in the listening mode and is ready to accept the

request from other clients

Description Notes:

• A SIM card must be inserted in order to use this command.

• The PIN 1/CHV 1 code must be entered to use this command.

• The PIN 2/CHV 2 does not have to be entered to use this command.

• The +WIND general indication command value from which +WIPCREATE

is allowed is 4. This value (4) indicates that the product is ready to process

AT commands (except phonebooks, AOC, SMS), but is still in emergency

mode. See Appendix A – GSM/GPRS +WIND AT Command.

Closed

Listen

Server Socket

Create

Close Server

Socket channel

Server listening to the

remote socket for connect

request

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Multitech MMCModem GPRS (MTMMC-G) Manual de usuario Pagina 15