Sierra Wireless DART 300 manual Using UDP/TCP Service, Save Configuration, Server Sessions

Configuration and Use DART 300 Modem

8.2.6.Save Configuration

Configure any command state options and save the configuration. Set the data rate for the target device.

16.Optionally set any application required settings for the DTE/DCE command interface; items such as: Echo, the default is on (E1); Quiet, the default is off (Q0); and Verbose, the default is on (V1).

17.&W to save the configuration.

18.Set the data rate used by the application if it is not 19200 bps. Use +IPR=n where n is the rate to use. The modem will preserve the new setting and reset after this command. The modem will then re-start, implementing the configuration as made in the steps above.

The modem may now be installed with the intended local host device, either for testing at the bench or at the application site.

8.3. Using UDP/TCP Service

The modem is used either as a server or a client. This section discusses use separately for each application.

8.3.1.Server Sessions

Server sessions are those in which the DART 300 answers a “call” from another system. The behaviour of the modem when a client call is detected will depend on the settings of auto-answer and flow control with special attention to host sleep and wake-up using the Ring Indicator. The details of these various issues are covered below.

At an even higher level is the capability of the host device, particularly whether it is intelligent or dumb. If the local host device is capable of handling the modem’s AT command interface it is considered intelligent; if it can receive data and respond to it but not handle AT commands, it is considered semi-intelligent. Dumb hosts are not capable of receiving data.

8.3.1.1.Server Initialization

The modem is enabled or disabled from handling server sessions by the setting in

+WS212 (Listening Port). A setting of 0 disables the modem from answering server requests. Setting the register to a valid port (1025 – 4999) will enable the server side of the protocol stack.

A server configuration does not necessarily require any action by the local host at start-up. If configured to auto-register, the modem will be ready to answer client calls shortly after power-up or reset. The local host device can simply wait for a connection request to come in. Dumb hosts may actually be sending telemetry on the DTE/DCE link which the modem will ignore, presuming the data does not meet the syntax of an AT command.

On start-up, the DART 300 will issue the OK result code (unless Quiet mode is on), and then assert the CTS control line to indicate the modem is ready.

If manual registration is used, the modem also needs to register using the +WPREG command. If multiple NEI accounts are available, the account to register must first be selected using +WS197.

The host then waits for a client connection request. The modem will remain in command state until a message is received from the network.

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