Serial LTE modem strange double Ready after wakeup

[Michal Mühlpachr]

nRF9160 DK NCS v1.6.0, SLM with:

CONFIG_SLM_GPIO_WAKEUP=y

CONFIG_SLM_INTERFACE_PIN=24

Sometimes after at#xsleep=0 and several pulses on pin 24 SLM wakeups with double Ready response:

AT

OK

at#xsleep=0

Ready

at#xsleep=0

Ready

Ready

AT+CFUN?

+CFUN: 0

OK

[Albrecht Markus Schellenberger]

Hello Michal,

is this something you observe in NCS v1.6.0 only, or can you reproduce the behaviour in earlier versions as well?

I might want to be interested in how those “several pulses” look like. Can you elaborate?

Regards,

Markus

[Michal Mühlpachr]

It is observation related to NCS v1.6.0 only.
I make "several pulses" by scratching GND plane on USB connector by wire.
It usually takes 3-5 trys (sleep-wake) to get double Ready from SLM during wakeup.