I'm using the EthernetNetIf library and have set up my program to display temperature and other data over http. I've added net::poll to my program loop and while this does actually work it can be slow to respond. Now I think this is because my main program loop takes around 10 seconds to run through.

Clearly I could optimise the main loop but is there any alternative to net::poll that works like an interrupt or could I make net::poll a ticker? Ideally I want the program to respond instantly to the http request regardless of what else it may be doing...

Thanks.

The way forward depends on whether the server sends the data:

1. only when asked? 2. or does it send continually, without needing an HTTP GET request?

If 1. you can use raw lwIP commands to send a GET request. The function used to send the tcp_write can then include a pointer to a callback function which will generate an interrupt when the data response arrives.

See tcp_write, tcp_output, tcp_recv

http://lwip.wikia.com/wiki/Raw/TCP

If the data streams in without needing to be asked, then yes, set up a Ticker as an interrupt with net::poll() in there.