NRF_ERROR_SVC_HANDLER_MISSING PC at 0x00025D3D

user4240 said:

And another thing, could you try to comment the APP_ERROR_HANDLER() call at line ~119 to ignore com. errors,  then check then check if the event gets triggered multiple times or just once.

Strangely! Just when I send  "MQTT_QMTOPEN", it will cause this error.

And this only happens when the bootloader is present?

user4240 said:

And this only happens when the bootloader is present?

Yes. If I just download soft device, this application will work normally.

OK, thanks for confirming. I still don't see how the bootloader could be impacting this. Does the MQTT_QMTOPEN command cause the receiver to respond with more data than the other commands?

user4240 said:

MQTT_QMTOPEN command cause the receiver to respond with more data than the other commands?

But I don't edit the application process when I removed bootloader.