7. TCP/IP STACK
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7. 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.
This is available through the embedded applications (see previous section)
using intrinsic functions and also through AT commands (see GR47/GR48
AT commands manual).
7.1 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 lookup command in DOS
When the unit is set up and controlled using the embedded applications
either the embedded applications or an external application can generate
data to be sent and pass it to the radio device for transmission.
This effectively provides a transparent communication link to an internet
server from the application over GPRS.