RE: Mesh DFU Recovery

Thomas-Brilliant — Thu, 25 Apr 2019 18:18:56 GMT

Thanks for explanation, Edvin!

RE: Mesh DFU Recovery

Edvin — Thu, 25 Apr 2019 07:56:36 GMT

Hello,

[quote user=""]If the Mesh DFU process fails (maybe a packet gets dropped or something), what happens? Will the device get stuck in an unknown state? What does the recovery process look like?[/quote]

There is a timeout that handles this. By default, it is set really long (10minutes), but you can change this.

There are to timeouts:

1: Timeout from the first DFU packet: If the time between the first packet and the transfer complete exeeds TIMER_START_TIMEOUT_US (from nrf_mesh_dfu.c) then the DFU will be aborted.

2: Timeout from the last DFU packet: If the time between two DFU packets exceeds TIMER_DATA_TIMEOUT_US (from nrf_mesh_dfu.c) then the DFU will be aborted.

By default both of these defines are 600 000 000 µs = 10 minutes, but you can change them. (Obviously, with the current settings, the TIMER_DATA_TIMEOUT_US would be redundant).

[quote user=""]Also is the DFU process atomic (as in, it completely succeeds or completely fails)?[/quote]

Yes. If the DFU times out, or the keys and application version/ID doesn't match, the entire image is removed.

Best regards,

Edvin