Unable to establish BLE connexion on NRF52840_DK target

[lu0m4n]

• Type: Bug
• Priority: Blocker

---

Bug

Target
NRF52840_DK

Toolchain:
GCC_ARM

Toolchain version:
arm-none-eabi-gcc.exe (GNU Tools for ARM Embedded Processors 6-2017-q2-update) 6.3.1 20170620 (release) [ARM/embedded-6-branch revision 249437]

mbed-cli version:
1.2.0

mbed-os sha:
a67c729 (HEAD -> master, origin/master, origin/HEAD) Merge pull request #97 from 0xc0170/master

Expected behavior
When the device is advertising, we should be able to establish a BLE connexion.

Actual behavior
The connexion fails with a timeout error.

Steps to reproduce
Using a NRF52840_DK target, build any of the mbed BLE example and run it.

[0xc0170]

cc @pan- @nvlsianpu

[pan-]

@lu0m4n I've just tried with the example BLE_BatteryLevel and I have no trouble to connect to the device.

[lu0m4n]

@pan Thanks for the feedback. Could you please share details about your environment, mbed version, board revision ... ?

[pan-]

@lu0m4n

Target
NRF52840_DK (10056)

Toolchain:
GCC_ARM: arm-none-eabi-gcc.exe (GNU Tools for ARM Embedded Processors 6-2017-q1-update) 6.3.1 20170215 (release) [ARM/embedded-6-branch revision 245512]

mbed-cli version:
1.2.0

mbed-os-ble-examples sha:
a67c729

[lu0m4n]

Thank you @pan-

I swtiched from LightBlue to nRFConnect as debug application, and noticed in logs that the connection is establishing succesfully. So I don't know why it doesn't manage to display GATT database services and characteristics.

[lu0m4n]

I tried on an Android tablet and it works well. It appears the problem has nothing to do with mbed but is specific to iOS device. Anyway, thank you for your help.

[pan-]

@lu0m4n Is the discovery of services automatic in LightBlue ? That may be your issue.