TCP/IP STACK
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LZT 123 8020 R1A
8 TCP/IP Stack
An on board IP/TCP/UDP stack has been integrated into the
software negating the need for the customer to implement one
in their own code base.
The TCP/IP stack is accessible via AT commands.
8.1 Implementation
The following types of commands allow various functions:
•
Open/closing IP connection - Negotiates/closes a dynamic
IP address with the web server.
•
Send/Receive TCP packets - Performs all TCP operations to
send and receive packets.
•
Send/Receive UDP packets - Performs all UDP operations
to send and receive packets.
•
Resolve URL to an IP address - Similar to nslookup
command in DOS
•
Server/listen mode - This allows the unit to negotiate an IP
address for itself and then listen for incoming traffic.
The implementation effectively provides a transparent
communication link from the application to an internet server
over GPRS.
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