8. Interfacing with UnetStack
You now know how to set up a Unet. Let us next explore how you can go about interfacing your application with UnetStack to take advantage of the Unet. There are several options available:
UDP portals ( Section 10.1 ) provide a way to establish tunnels through the Unet for UDP datagrams. This facility can be used to transparently run applications that use UDP, over the Unet.
TCP portals ( Section 10.3 ) and serial portals ( Section 10.4 ) provide a way to establish connection-oriented tunnels through the Unet. This is a simple way to run applications that communicate over a TCP/IP or serial port links, over the Unet.
Many traditional modems provide an AT command set for applications to interact with them. While we do not encourage the use of AT commands (as they are error-prone and limited in functionality), it would be amiss not to mention that UnetStack also supports an AT script engine ( Chapter 12 ) that may be used by legacy applications to interact with it using AT commands.
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