Serial LTE Modem sample not reponding to any AT commands from LTE link monitor

[ericlestor]

Hi,

I have a nrf9160DK and flashed it with Serial LTE Modem sample, however all the AT commands are just timing out.

2022-09-06T10:18:35.621Z INFO Modem port is opened
2022-09-06T10:18:41.875Z DEBUG modem >> AT+CFUN?
2022-09-06T10:18:42.876Z ERROR Error: 'AT+CFUN?
' timed out

Configuration is default and UART 0 is used.

CONFIG_USE_SEGGER_RTT=n
CONFIG_RTT_CONSOLE=n
CONFIG_UART_CONSOLE=y
CONFIG_LOG_BACKEND_RTT=n
CONFIG_LOG_BACKEND_UART=y

# Use UART_0 (when working with PC terminal)
# unmask the following config
CONFIG_SLM_CONNECT_UART_0=y
CONFIG_UART_0_NRF_HW_ASYNC_TIMER=2
CONFIG_UART_0_NRF_HW_ASYNC=y
CONFIG_SLM_WAKEUP_PIN=6
CONFIG_SLM_INDICATE_PIN=2

What is the problem here?

[Hakon]

Hello,

try setting RTT as the logging backend instead of uart. You don't want the serial output to interfere with the SLM communication.

[ericlestor]

Can't get this to work. Any help would be appreciated.

[Sigurd]

Will be handled in this case:

 Serial LTE Modem sample not reponding to any AT commands from LTE link monitor 

Closing this case.