Writing to Peripheral from Central

RE: Writing to Peripheral from Central

Jimmy Wong — Thu, 13 Jun 2019 13:43:15 GMT

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.

RE: Writing to Peripheral from Central

Aamir — Thu, 13 Jun 2019 13:13:18 GMT

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.

RE: Writing to Peripheral from Central

Aamir — Fri, 31 May 2019 11:40:47 GMT

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 ?

RE: Writing to Peripheral from Central

Aamir — Mon, 27 May 2019 10:28:27 GMT

Ok, so, I started off from a fresh ble-central example and started to add each characteristics 1-by-1 and I put up counter named 'flag' in the

ble_lbs_on_db_disc_evt()

like this

case LBS_UUID_ALARM_CHAR:
evt.params.peer_db.alarm_handle = p_char->characteristic.handle_value;
flag++;
break;

case LBS_UUID_BUZZER_CHAR:
evt.params.peer_db.buzzer_handle = p_char->characteristic.handle_value;
flag++;
break;

so that I know if my characteristic is getting found and assigned a handle

and so, I found a weird behavior, the program stopped discovering characteristics above the count of 5

meaning after 5 discovering 5 characteristics it won't proceed to discover any more characteristics, till 5 characteristics everything works fine.

I took a quick glance through the sdk_config.h file to see if there is any setting related to this, but, I couldn't find any ?

is there something I am missing ?

RE: Writing to Peripheral from Central

Aamir — Mon, 27 May 2019 05:24:59 GMT

Now, I have made several characteristics, some gets called and some doesn't, and there is no obvious reason as to why that is the case. I have inserted a breakpoint at ble_lbs_on_ble_evt to check if it is being is called and what I observed is that it works for some characteristics and for some it doesn't. I tried changing the order in which I define characteristics and reordered their characteristic UUID then the ones that were not working before began working, I am really confused.

I still haven't tested with a sniffer trace, but the logs on the central side shows successful sending of the data.

RE: Writing to Peripheral from Central

run_ar — Fri, 24 May 2019 12:00:53 GMT

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?