Ping Protocol

Wifidog uses the ping protocol as a heartbeat mechanism to send current status information to the auth server. This enables central logging of the status for each node at the auth server.

The wifidog client uses a setting in the conf file to periodically start a thread ( ping_thread.c ) to send a status message via http to the auth server. The message format is

http://auth_sever/ping/?
gw_id=%s
sys_uptime=%lu
sys_memfree=%u
sys_load=%.2f
wifidog_uptime=%lu

With the data gathered via system calls on the wifidog client.

Headers
HTTP/1.0\r\n" 
"User-Agent: WiFiDog %s\r\n" 
"Host: %s\r\n" 
"\r\n",

A typical url would be: /ping/?gw_id=001217DA42D2&sys_uptime=742725&sys_memfree=2604&sys_load=0.03&wifidog_uptime=3861

To this the auth server is expected to respond with an http message containing the word "Pong".