Sending CTRL-Z over UART

[frijj2k]

Hi, I have a SIM800L GSM/GPRS module that I can successfully talk to via the UART on the nRF51.

I can tell it to dial numbers etc and that all works fine.

My problem is that to send an SMS, the final character (after inputting the message) needs to be a CTRL-Z sequence. (Dec 26 - Hex 1A)

If I enter the AT commands via a terminal and an FTDI cable, everything is working. But when I try sending the sequence from the nRF51's UART, everything 'looks' good apart from the CTRL-Z character which shows itself as a '.' on my terminal and the SIM800L module ignores it.

I have tried placing the CTRL-Z sequence within my string via sprintf and also I have tried manually sending it at the very end directly via app_uart_put as follows...

err_code = app_uart_put((uint8_t)0x1A);  // CTRL-Z

But this doesn't work.

What am I doing wrong?

Thanks in advance!

[nada]

I'm sorry but I have the same problem here, so I was wondering if you had any solutions?

[MartinBL]

Do you send any termination characters after the Ctrl-z command? Usually when you type in something in a terminal and hit enter, the terminal also send a termination character like \n and/or \r (new line or carriage return). If you use a nRF52 and the usual UART drivers and libraries you will have to explicitly append these characters at the end. Have you confirmed whether this is the case and whether the GPS module expects such a character?