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ilithiiri · 01-14-2003, 13:56

Hallo.
I'm developing an application that connects to a nokia phone using data cable, issuing AT+ commands (e.g. at+csq, at+creg, etc).
My problem is the time one command take: "AT".

I use the "AT" command to "check if the phone is alive": once in a while (every 30 seconds approx.) I send the command AT (whose answer should be OK) to the phone. If I don't find any "OK" in my serial port's input buffer then I state that the cellular is not present. Else, if I receive "OK" on the serial port, the cellular is present.

I have put a little tweaking thing in the function I used to check the presence of the cellular that prints out the time the function needed to check the presence of the cellular.

When I start the program this value is 73/80 (1/1000 of a second).
The second time is 88/92, the third 105/107, and so on.
After an hour or two, this value grows up to a second.

An important thing to note is that other commands (like at+csq or at+cbc) spend always the same amount of time during the execution of my program (plus/minus 20 milliseconds, of course). The only command that takes always more amount of time to complete is "AT".

I'm using this nokia phone model:

at+cgmi
Nokia Mobile Phones

OK
at+cgmm
NSE-5

OK

formerly known as Nokia 7110, I think.

please help me

Fontani Marco - [email protected]

01-14-2003, 13:56	#1 (permalink)
ilithiiri Junior Member Join Date: Jan 2003 Location: Livorno (Italy) Age: 43 Posts: 8 Member: 19878 Status: Offline Thanks Meter: 0	at+ commands taking too much time. Hallo. I'm developing an application that connects to a nokia phone using data cable, issuing AT+ commands (e.g. at+csq, at+creg, etc). My problem is the time one command take: "AT". I use the "AT" command to "check if the phone is alive": once in a while (every 30 seconds approx.) I send the command AT (whose answer should be OK) to the phone. If I don't find any "OK" in my serial port's input buffer then I state that the cellular is not present. Else, if I receive "OK" on the serial port, the cellular is present. I have put a little tweaking thing in the function I used to check the presence of the cellular that prints out the time the function needed to check the presence of the cellular. When I start the program this value is 73/80 (1/1000 of a second). The second time is 88/92, the third 105/107, and so on. After an hour or two, this value grows up to a second. An important thing to note is that other commands (like at+csq or at+cbc) spend always the same amount of time during the execution of my program (plus/minus 20 milliseconds, of course). The only command that takes always more amount of time to complete is "AT". I'm using this nokia phone model: at+cgmi Nokia Mobile Phones OK at+cgmm NSE-5 OK formerly known as Nokia 7110, I think. please help me Fontani Marco - [email protected]