GSM modem, javacomm, AT commands
Hi
I have been trying to develop a program to be used to make a connection to GSM modem via COM1-port. From there, I need to be able to read received SMS messages. I have AT commands needed to do that, and I have tested them in hyperterminal. I have installed javaComm.
My problem is that I don't know HOW am I supposed to send AT commands to modem, and how to receive answer. I have looked at these examples:
http://java.sun.com/developer/releases/javacomm/SimpleRead.java
http://java.sun.com/developer/releases/javacomm/SimpleWrite.java
in which (simplewrite) I have tried to replace String value of "Hello World!" to AT command, which did not have desired effect (modem did not act like it should when command is received). I need some help here to succesfully send AT command to modem, and to receive the answer.
Thanks for your time.
[883 byte] By [
Akulaaria] at [2007-11-27 9:07:07]
Actually I made it without JTAPI. I just had to add /r in string of AT command, which was to be sent to modem. Anyway. Using these two example codes mentioned above, and connecting them into one, I managed to get a program which sends AT command to modem and receives the answer.
However the answer is not quite what I expected, because usually it is only a few letters (for example OK or CPIN ) with strange long spaces between some letters. I'm using baud rate of 115200 to communicate with modem.
More problems came on my way on finishing my program. Situation:
I have 2 threads, one to send AT command to modem thru serial port and one for listening the answer using same port. Problem is, that I just can't get the answer from the modem. AT commands sent to the modem works fine, but no answer is received.
Source code:
http://mureakuha.com/paste/?9b6a28d4ee7e683ec98089f5cbc977f8
Thank you in advance.
