RE: how to solve an error which happened for registration of many BLE services

weightwatcherphil — Tue, 23 Apr 2019 15:23:54 GMT

Hello Bjorn,

this saved me!!! I consider it the greatest HINT of all time when dealing with adding custom services.

thank you!!!!!
Phil

RE: how to solve an error which happened for registration of many BLE services

bjorn-spockeli — Tue, 22 May 2018 06:10:03 GMT

Happy to help!

RE: how to solve an error which happened for registration of many BLE services

Yoshihiro Goto — Thu, 17 May 2018 01:03:20 GMT

Hello Bjorn,

Great! Finally I have solved this problem. it changes the value of NRF_SDH_BLE_GATTS_ATTR_TAB_SIZE from 1408(default) to 2000.

Thanks for your splendid advice.

RE: how to solve an error which happened for registration of many BLE services

bjorn-spockeli — Wed, 16 May 2018 17:11:53 GMT

Hi Yoshihiro,

could you state which function specifically that returns NRF_ERROR_NO_MEM?

If its sd_ble_uuid_vs_add that returns NRF_ERROR_NO_MEM then there are no more free VS UUID slots. If you're adding a custom service then you have to make sure that the Vendor Specific UUID count in sdk_config.h, NRF_SDH_BLE_VS_UUID_COUNT , is set to the number of custom services you are adding.

If it is sd_ble_gatts_service_add or sd_ble_gatts_characteristic_add or sd_ble_gatts_descriptor_add that returns NRF_ERROR_NO_MEM, then you're likely exceeding the default GATT table size set in the sdk_config.h file, NRF_SDH_BLE_GATTS_ATTR_TAB_SIZE. Try increasing it, but remember to adjust the RAM_START and RAM_SIZE accordingly.

SoftDevice will actually tell you if you have allocated to little RAM, i.e. it will return the application RAM start address. You can start a debug session with a breakpoint after the sd_ble_enable() call in nrf_sdh_ble_enable() in nrf_sdh_ble.c

If you have RTT logging enabled( should be enabled by default in the ble_app_template example) then the RTT output will be displayed in the Debug Terminal in Segger Embedded Studio or in Segger RTT Viewer if your using another IDE.

<warning> nrf_sdh_ble: Insufficient RAM allocated for the SoftDevice.
<warning> nrf_sdh_ble: Change the RAM start location from 0x20002210 to 0x20002220.
<warning> nrf_sdh_ble: Maximum RAM size for application is 0xDDE0.
<error> nrf_sdh_ble: sd_ble_enable() returned NRF_ERROR_NO_MEM.
<error> app: ERROR 4 [NRF_ERROR_NO_MEM] at C:\Nordic_Semiconductor\SDK_Repository\nRF5_SDK\nRF5_SDK_15.0.0_a53641a\examples\ble_peripheral\custom_ble_service_example\main.c:663
PC at: 0x0002EF37

It is also possible to use the UART backend instead of the RTT backend by setting
NRF_LOG_BACKEND_RTT_ENABLED to 0 and NRF_LOG_BACKEND_UART_ENABLED to 1 in sdk_config.h.
In both cases you'll see the following output in the Debug Terminal/Serial TErminal/RTT Viewer if you have allocated to little RAM for the SoftDevice.