GATT Timeout on writing to buttonless dfu characteristic

[fhfs]

Hello Devzone,

We update our peripheral device(nrf52) with our gateway(nrf52840, central) using the DFU protocol. We have this working and the DFU update is successful when the device actually restarts to the bootloader.

However, when we start the DFU process by writing the instruction to restart to the bootloader, to the buttonless dfu characteristic. We sometimes get a gatt timeout (BLE_GATTC_EVT_TIMEOUT). We are subscribed to the buttonless dfu characteristic and we are using SDK 17.0.2.

Do you have any idea why we are getting this gatt timeout?

I reviewed the DFU logs from the nRF Connect app, and I've noticed a delay after the service discovery and subscribing to notifications. Do we need to add a delay there?

[Simonr]

Hi

Thank you for answering my initial questions!

Sniffing a connection between paired devices is possible, and it's described how to that for connections that use LESC is described at the bottom of the Common Sniffing Actions guide here. 

Best regards,

Simon

[fhfs]

Do you know how to enable this debugging mode?
We are currently using LESC with OOB.

My best guess is setting the mode to just-works, but where do I put/set the public/private debug keys?

[fhfs]

I can indeed sniff LESC Just-Works connections with the nrf-sniffer and wireshark.
Daniel's method works perfectly

[Susheel Nuguru]

Hi, Simon is on summer vacation and hence the delay in response. Good to know that you are now able to sniff the packets during LESC connected peers.