Writing to Peripheral from Central

[Aamir]

Hi, 

I am using nRF52840 Preview DK, with SDK V15.3.0 and Softdevice API V6.1.1

First, I modified the 'ble blinky peripheral example' to have more characteristics tying it to appropriate event handler and I have verified that it works using nRF Connect App.

Secondly, I modified the 'ble blinky central example', in that instead of the UUID of LED characteristic , I inserted the UUID of my own characteristic, my characteristic has the same attributes and structure as the  LED characteristic. 

On the central the characteristic is successfully found and given a connection handle, when I write to it by pressing the button, the event is properly executed and writing message gets printed.

but, there seems to be no action on the peripheral side, it receives nothing, when I again change the UUID to LED characteristic everything works fine and it's event handler gets called on the peipheral, but, with my chacteristic UUID no action takes place on the peripheral side.

can someone please explain ?

[run_ar]

First I would recommend that you get a new DK, the preview kit has an engineering revision chip, and SDK 15 is not tested against that.

Do you have a sniffer trace that shows what is happening? Also are you getting a call to ble_lbs_on_ble_evt when you perform the write?

[Aamir]

I rearranged the order in which the characteristics is defined and now it discovers up to 6 characteristics and nothing further, and now it is the same with nRF Connect mobile app ?

I am really confused? can someone please explain ?

[Aamir]

Can someone please answer me? every time I change the order of characteristics, I get different number of characteristics discovered, I need all of the services to be discovered. 

[Jimmy Wong]

HI ,

You can try to refer to my example https://github.com/jimmywong2003/nrf5-ble-multiple-role-example.

I add the lbs+nus central (ble_app_lbs_nus_c).

You can use the NUS_C client to write cmd to peripheral role.