WIFLY GSX WIFLY EZX

WiFly GSX/EZX
www.rovingnetworks.com WiFly-RN-UM 4/8/2011
11. Sending data using UDP
11.1. Overview
UDP is a connectionless protocol. There is no initial handshaking between the hosts to set up the UDP
connection. There are no acknowledgements sent by the receiver for UDP packets that it receives. This
makes UDP an unreliable protocol, as there is no guarantee that the data will be correctly delivered.
However, due to its connectionless nature, UDP is suited for applications that cannot tolerate too much
latency but can tolerate some errors in data. Transmission of video would be a good example of UDP
application.
To use UDP on the WiFly-GSX module, you will need to enable the UDP protocol using the command “set
ip proto 1”. You will also need to specify the remote host IP address and the local and remote port number
that you will use for UDP communications.
The commands to enable UDP data transfer are:
Associate to a network:
set wlan ssid
set wlan phrase
// set the network name
// set the passphrase for WPA and WPA2 modes
Set up the protocol and port number
set ip proto 1
set ip host
set ip remote
set ip local
save
reboot
// enable UDP as the protocol
// set the IP address of remote host
// set the remote port number on which the host is listening
// set the port number on which the WiFly module will listen
// saves the settings in config file
// reboots the module so that the above settings take effect
NOTE: If you attempt to send data by physically typing characters on the keyboard or if your
microcontroller is not sending data fast enough, the WiFly module will send out packets with less data
bytes. To avoid this, set the flush timer to a higher value. By default, it is set to 10 milliseconds. You can
choose to either disable forwarding based on flush timer (use “set comm. time 0”) or set it to a higher value
(e.g. set comm. time 2000)
Since UDP is a connectionless protocol, data will start flowing as soon as the module is rebooted. Unlike
TCP, it is not required to do an “OPEN” for the connection to be established. The WiFly-GSX module acts
like a data-pipe, so the UART data will be sent over the Wi-Fi link via the UDP protocol (in this case) and
the data coming over the Wi-Fi link (via UDP protocol in this case) will be sent to the UART.
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