nRF SDK. How many characteristics is possible to add to one service?

[ipshiv]

Hi!

I'm working with legacy code based on nRF SDK 15 and SoftDevice v6 for nrf52840.

I receive error #4 - no memory, when I'm trying to add more than 19 characteristics into one service. I tried to change FLASH and RAM settings, but no success.

The questions are:

1. are there any hidden definitions which prevents adding many characteristics?
2. how many characteristics is possible to add in one service?
3. how many services is possible to add to one peripheral device?

Environment:

1. nRF SDK15.2
2. SoftDevice s140 v6
3. IDE: SES
4. DEVKIT: pca10056

[ipshiv]

Solved.

You should change:

1. BLE_GATT_DB_MAX_CHARS in ble_gatt_db,h

2. NRF_SDH_BLE_GATTS_ATTR_TAB_SIZE 38160 in sdk_config (value as an example. With this value I was able to add about 600 characteristics to one service).

This value is close to limit for simple applications, because you have to keep RAM for application itself.

[Ayu7]

Hi, I tried changing BLE_GATT_DB_MAX_CHARS from 6 to 100 and NRF_SDH_BLE_GATTS_ATTR_TAB_SIZE. But its not working. What can be the issue. And do I need to change anything in the RAM.  I am trying to add 100 characteristics in one service.

[AlanBle]

hello ， 

have you solved this problem , unfortunately ，I am meeting the same issue.