| ??? 03/02/08 20:40 Read: times Msg Score: +1 +1 Good Answer/Helpful |
#151765 - Polling Responding to: ???'s previous message |
Karandeep Singh said:
if my terminal is a web server and connected to internet and hav a static ip let say 192.168.0.251 cant there be a way that i can access the terminal by PC with internet connection or through a website. A very common approach to this is to have the terminal call a central website on a regular basis to report its status and pick up any commands from the Internet server. So if you want to instruct the terminal to do something, you just write software on the Internet server that stores those instructions. Then, the next time the terminal calls the public website, that website passes on the requested instructions to the terminal. Then it's just a matter of how often your terminal needs to call the central website. If you need high response rate, perhaps once per minute. If you don't need such high response, maybe every hour or every day. But this approach means you only need one public website. You will also avoid problems with firewalls which will typically be a problem if you have these terminals on local networks that are usually separated from the Internet by a firewall. If your terminal calls out to the HTTP port (port 80) then you usually can reduce your firewall-related headaches. Regards, Craig Steiner |
