What is the order in which the Softdevice will process WRITE_REQ and WRITE_CMD

[Marius Heil]

Hi,

I am wondering if the SoftDevice preserves the order of the sd_ble_gattc_write calls internally when mixing WRITE_REQ and WRITE_CMD?

If I queue a packet using WRITE_CMD, then another one using WRITE_REQ and a third one using WRITE_CMD again, will this be the order in which they are sent to the other device or not?

Is this the same behaviour on all Softdevices, also the older ones?

Thanks,

Marius

[Einar Thorsrud]

Hi,

The packets are buffered and transmitted in the order they were queued. I believe this has always been the case.

(Note that there are separate queues for separate connections, so if you have a multilink device, then packets one link may be transmitted before packets on another connection, even though the latter were passed to the SoftDevice earlier.)

[Marius Heil]

Thank you, that helps me a lot. I was assuming this all the time but was never 100% sure. I just updated that behaviour in our simulator as there was a bug in there.