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AT+i Programmer's Manual - SE Spezial-Electronic AG

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Connection<br />

sending binary data (SSND, FSND, EMB), iChip reports error code 094 as soon as it can<br />

and only then tries to re-establish the connection. In all other cases, iChip gives the host<br />

no indication of losing the carrier. In the event of Carrier Lost, iChip closes any open<br />

TCP active sockets, but leaves UDP sockets and TCP passive (listening) sockets intact<br />

and updates their local IP if a new IP is assigned after establishing a new PPP connection.<br />

iChip does not close any open Internet sessions (FTP/Telnet sessions and so on), nor<br />

releases the handle of the active TCP sockets, thus giving the host a chance to read the<br />

session errors and get buffered incoming data from active TCP sockets.<br />

4. When the PFR is larger than 0 and the PDSn parameters are configured, iChip<br />

verifies that it is online by sending PING messages to the PING destination servers<br />

defined in PDSn at a polling frequency defined by PFR. If both PING destination servers<br />

do not respond, iChip concludes that the Internet connection failed and tries to reestablish<br />

an Internet connection, as described above for the case of a lost carrier signal.<br />

<strong>AT+i</strong> Programmer‘s <strong>Manual</strong> Version 8.21 5-4

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