sd_ble_gatts_characteristic_add() error code 0x4 No Memory for operation.

[frogofmagic]

Hello all, I am using nRF51822 SDK8.1.0 SD130 The code was a central, and I want add a peripheral function. I reference \examples\ble_central_and_peripheral\experimental

I got 2 error when I call void own_service_setup(void)

1. sd_ble_gatts_characteristic_add() error code 0x4
2. sd_ble_gatts_descriptor_add() error code 0x8

Can somebody please advice me about these error and about fix it?

[Bill Siever]

This probably indicates that your characteristics are consuming all of the Soft Device memory that's available for characteristics.

If this is the case you can overcome it by keeping some characteristics in user memory. You can do this by setting the vloc variable of the characteristic's ble_gatts_attr_md_t to BLE_GATTS_VLOC_USER. You will need to make sure that you use persistent memory for the characteristics (like a global or static local variable rather than just a stack local).

See http://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.s130.api.v1.0.0%2Fstructble__gatts__attr__md__t.html and search the forum for vloc for more info.

[Bill Siever]

frogofmagic, I suspect the SoftDevice RAM segment has different internal buffers: 1) space to save the values of Characteristics and 2) space reserved for radio processing needs. I've received these sorts of memory errors on projects that used several somewhat long characteristics (i.e., my data used all the internal buffer space available for characteristics). I was able to work around the limitation by placing some of the characteristics in user RAM rather than have the Soft Device manage them (vloc set to BLE_GATTS_VLOC_USER).