kazimi
Newbie level 5
www + gprs
Hello!
I have to construct a system, which uses data transmission over gprs (tcp/ip) to control and monitor a building. The idea is like following: user can log in (www) and then he sees his control and monitoring panel. Data are sent over gprs to the device. This device consists of uC and GSM module (has implemented tcp/ip, i used such a module, but I was sending smses only). I know, that such a module has to have sim card with public ip (the best is, when it is static ip). And I know (I tried this before), that there is no problem to do transmission module->server. It can be done via standard AT commands. But I do not know, how to transmit data in the other direction: www -> module. Ok, I understand, that such a module has simcard with ip, but is it possible, that www will initiate the connection? So if server will send something to the module, who is going to pay for that? I cannot understand that.
I will be thankful for any advice (I need this for my master thesis).
Regards,
kazimi
Hello!
I have to construct a system, which uses data transmission over gprs (tcp/ip) to control and monitor a building. The idea is like following: user can log in (www) and then he sees his control and monitoring panel. Data are sent over gprs to the device. This device consists of uC and GSM module (has implemented tcp/ip, i used such a module, but I was sending smses only). I know, that such a module has to have sim card with public ip (the best is, when it is static ip). And I know (I tried this before), that there is no problem to do transmission module->server. It can be done via standard AT commands. But I do not know, how to transmit data in the other direction: www -> module. Ok, I understand, that such a module has simcard with ip, but is it possible, that www will initiate the connection? So if server will send something to the module, who is going to pay for that? I cannot understand that.
I will be thankful for any advice (I need this for my master thesis).
Regards,
kazimi