Trouble in changing back into data mode in HL6528

IoT Modules Legacy HL Series
1

I’ve succeeded in switching into command mode. I needed to read the SMS and switch back into data mode again. But when I enter “ATO0” command, It replies “OK”. But not connecting into data mode. Instead it resets the modem. I need to switch back into data mode without stopping the service and resetting the modem.

void ReadSMS(void)
{
    unsigned char MSGBuffer[40];const char limit[2]=",";char *to = (char*) malloc(6);
    Modem_Send("+++",3);// Enable Command Mode for HL6528
    delay_1Sec(1);
    ModemWaitForAtResponse(NULL,80,10);
    GPRS_Data_Mode=0;
    Modem_Send("AT+CMGF=1\r\n",12);
    ModemWaitForAtResponse(NULL,80,10);
    Modem_Send("AT+CMGR=1\r\n",12);
    //ModemWaitForAtResponse(NULL,80,30);
    ModemWaitForAtResponse((char *)MSGBuffer,80,40);
    printf("*****************\r\n");
    printf("%s\r\n",MSGBuffer);
    Modem_Send("ATO0\r\n",6);
    ModemWaitForAtResponse(NULL,80,60);
    delay_1Sec(1);
}
2

Hi,

I would just send ‘ato’.

Regards

Matt

3

I tried sending “ATO”. Unfortunately modem didn’t switch into data mode. Instead I got a Modem response “OK” when I was expecting “Connect” response.
Also can you please confirm the response of ATO?
Will the response be just “Connect” or any string followed by the Connect response?

4

I would expect it to just be CONNECT, the rate after it is a hang over from the circuit switched days where the baud rate you got was hard fixed by the link so now typically you do not get one.

Regards

Matt