Enable/Disable JTAG in SLM nRF9160

[SharathMalve]

Hi

In the final SLM version , please provide an option to disable and enable JTAG in software (thru AT command or by some means)

As part of security, this is needed

Regards

Sharath

[Martin Lesund]

Hi Sharath,

Regarding security, I strongly suggest against another solution than using APPROTECT, e.g. where you could "disable"/"enable" JTAG with an AT command.

If you really need access to the JTAG port for a device in the field, then you could just connect, erase the application and re-flash the same application then you can debug as much as you'd like.
I think that is the best current solution and also secure against any other people getting access to the application.

Please specify why you would like to access the JTAG port for a device out in the field.

Best regards,
Martin L.

[praveenpalaparthi]

Hi Martin,

The suggestion you gave is valid, but before re flashing the unit with debug code, if we want to read the logs from the faulty unit how we can get the logs. 

Can we have AT Command to read RTT logs through serial interface.

or

Through serial AT command to enable disable RTT logs

With regards,

Praveen Palaparthi

[Martin Lesund]

Hi Praveen,

If you have any faults in the nRF9160 you can make sure to save the latest URCs in the external MCUs Flash for example.

or 
Just enable the necessary debug logging/UART GPIO changes for example in the spesific application that you use when re-flashing the device in the field. 

Best regards,
Martin L.