Disable SMP server n seconds after MCU booting

Question

Hello! 
 We have an application with an nRF52832 connected through an UART to another MCU. We want to have the possibility to update the nRF FW, but as nrF52832 only has 1 UART, there is no straightforward way to share it with APP and SMP server at the same time. 
 Is it possible to do the following? 
 1- Boot with SMP server and wait a few seconds for an incoming image upload command. 
 2- If no SMP communication is received after n seconds, disable SMP server until next reboot and start APP which can use UART without problems. 
 Thanks in advance! 
 Regards.

Sigurd Hellesvik · Accepted Answer

Hi Pedro, 
 I will continue working on this case. 
 The way Zephyr works, it is generally hard to disable features set in Kconfig (prj.conf) during runtime. When looking at the SMP Server code, I can not find any functions for deactivation. 
 From your explanation, I would say that Serial Recovery is the solution you need. The only requirement for this would be one pin from the other MCU to one of the nRF pins to initiate the Serial Recovery. 
 You say you need dual slot on your nRF with serial recovery. This is usually not needed, since you can always do serial recovery again if it fails the first try. If you explain why you want dual slots, I think I will be better able to help you find a good solution. 
 Regards, Sigurd Hellesvik

Disable SMP server n seconds after MCU booting

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