MC55_ATC_V04.00 Page 221 of 475 3/17/06
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Address notation
Server addresses must be provided as IP addresses in standard dot-format (e.g. "192.168.1.2") or as server
address names resolvable by a DNS server (e.g. "smtp.myserver.de" or "pop3.myserver.de").
Timeouts
Timeouts are not part of the Internet AT command functionality implemented in MC55 and, if desired, are the
responsibility of the host application. It is recommended that the host application validates URCs and AT com-
mand responses and reacts adequately, for example by sending a close message or starting a timer.
Socket UDP client
The significant differences between the TCP and UDP protocols imply that UDP sometimes requires particular
procedures or even specific parameters. Details on how to handle UDP services can be found in extra notes or
are included in the general parameter descriptions.
Using the DCD line to detect the connection status of Internet services
With AT&C you can configure the DCD line of the used serial interface to indicate whether an Internet service is
active. For Socket, HTTP, SMTP and POP3 the states "Up" or "Connecting" are indicated, for FTP only the state
"Up".
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