Program - SR_<name function template>

Program Contained in the Function Template

The function template provides a program which has been created in programming language ST (Structured Text). This program is added under the Application node within a folder with the name assigned within the Add Function From Template dialog box. The program has the same name as the folder with the prefix SR_. A program-call is added automatically to the associated task.

The program implements the state machine for the http client with the following states:

State	Description
Idle	If the command `xCmdConnect` or `xCmdConnectTls` is detected, the connection to the http server is initiated.
Connected	If the command `xCmdPost` or `xCmdGet` is detected, the corresponding request is sent to the connected http server.
ResponseAvailable	The received response is processed and data is stored in the corresponding variables `sResponseHeader` and `sResponseContent`. Afterwards, the processing is acknowledged.
Error	If the command `xCmdReset` is detected, the http client is reset.

The logic implementing the DNS client is provided in the action DnsClient. This action is called from the program as long as the value of the variable sServerIp is a null string.