Hi there, I am using a GSM Shield with my Arduino Uno. I am making a call to a remote party and I am trying to figure out whether the remote party hung up, picked up, timed out or is busy. I have been reading about AT commands and responses and I get the impression that I should be getting different responses to these events, e.g. 7 / BUSY or 8 / NO ANSWER. (Maybe I am wrong to get that impression?)
The problem is whatever happens I always get 0 OK. And it's very unhelpful because I need to know what event occurred. I tried using the GSM library, I tried printing my AT commands directly to the serial, I have read the verbose responses... Always the same result - 0 OK:
36 42>%13%%10%OK%13%%10%
84 90>%13%%10%OK%13%%10%
...
This is my code
// libraries
#include
// PIN Number
#define PINNUMBER ""
String CONTACT_NUM = "";
// initialize the library instance
GSM gsmAccess(true); // include a 'true' parameter for debug enabled
GSMVoiceCall vcs;
GSM_SMS sms;
GSM3VoiceCallService callService = new GSM3VoiceCallService(false);
String remoteNumber = ""; // the number you will call
char charbuffer[20] = "";
void setup() {
// initialize serial communications and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for native USB port only
}
Serial.println("Make Voice Call");
// connection state
boolean notConnected = true;
while (notConnected) {
if (gsmAccess.begin(PINNUMBER) == GSM_READY) {
notConnected = false;
} else {
Serial.println("Not connected");
delay(1000);
}
}
}
void loop() {
Serial.println("Waiting for emergency signal...\n");
char alert[200];
readSerial(alert);
if (strcmp(alert, "s") == 0) {
Serial.println("SENDING EMERGENCY ALERT\n");
// Check if the receiving end has picked up the call
callService.voiceCall(charbuffer);
Serial.println("Call Established. Enter line to end");
// Wait for some input from the line
while (Serial.read() != '\n' );
callService.hangCall();
Serial.println("Call Finished");
\
}
}
Is it at all possible to figure out if the remote party hung up or never answered? What am I doing wrong? Also any idea what the too numbers and '>' mean before the response? I can't find information, maybe they are somehow useful?
Any advice would be appreciated, I am quite stuck and this whole area is way out of my expertise so I don't know what to look for anymore.
Thanks!