How to Restart SIM800L module when there is no signal

GSM/GPRS Modules SIM800L
#1

Hello!

I’m using an Arduino Nano with the SIM800L.
works fine.
I’m allowed to send SMS, and it sends SMS back.

My Problem:
Everything works fine, but when the modul has a bad signal (when it blinks fast), there is no chance to get a Signal again.

So i will need a Command, which resets the SIM800L modul, if it has a bad signal.

Thanks,
Bernhard

#2

Hi Bernhard,

To check network status you can use AT+CREG? command.

And, You can use command like AT+CFUN=0 and then AT+CFUN=1 to put module in flight mode and again back to normal mode. This would simulate a network reboot.

Otherwise you can use the RESET pin present on the module to restart it.

Regards,
Ravi

2 Likes
#3

Hello RaviPujar.

The same thing happens to me as teufber.
I am using the SIM800L for ppp in a Raspberry pi 3, but when the signal is lost for long periods the modem can not reconnect.
I do not know if the problem is at the ppp level or if the modem has frozen. The only solution is a reset?
The ppp connection attempt indicates: serial link appears to be disconnected.

Thank you.

#4

Please create separate threads for your questions. This is someones thread,

#5

RAVI YOU ARE A REALLY GREAT MAN , without you i never could be able to let work my sim800, thank you from a young electronic!!!

#6

Hello, I am new to sim800l with ardunio. I have a problem. I connect sim800l with cp2102 urat interface to check if sim800l is working well, I press AT ok, but ATD error, AT + cmgr error, … many more commands error, I don’t understand what is wrong, the light still flashes every 3 seconds, help me, thank you