Increasing the size of attribute table

Question

Hi, 
 I'm using SDK v15.3.0 which has s132 6.1.1 to program an nRF521832. I had a single custom service on my stack and that was working well. I added a second service and I got ERROR 4 [NRF_ERROR_NO_MEM]. I understand that this is caused by the attribute table size not being large enough. so I increased it from the default - BLE_GATTS_ATTR_TAB_SIZE_DEFAULT = 1408 - to 3000 - approximately more than the double as a starting point. This is definitely an overkill as my second custom service has less characteristics than the first. This is what I did to increase the size of the attribute table - line 18 was added: 
 static void ble_stack_init(void)
{
 ret_code_t err_code;

 err_code = nrf_sdh_enable_request();
 APP_ERROR_CHECK(err_code);

 // Configure the BLE stack using the default settings.
 // Fetch the start address of the application RAM.
 uint32_t ram_start = 0;
 err_code = nrf_sdh_ble_default_cfg_set(APP_BLE_CONN_CFG_TAG, &ram_start);
 APP_ERROR_CHECK(err_code);

 ble_cfg_t ble_cfg;
 memset(&ble_cfg, 0, sizeof ble_cfg);
 ble_cfg.conn_cfg.conn_cfg_tag = APP_BLE_CONN_CFG_TAG;
 ble_cfg.conn_cfg.params.gatts_conn_cfg.hvn_tx_queue_size = 13;
 ble_cfg.gatts_cfg.attr_tab_size.attr_tab_size = 3000;
 err_code = sd_ble_cfg_set(BLE_CONN_CFG_GATTS, &ble_cfg, ram_start);
 APP_ERROR_CHECK(err_code);

 // Enable BLE stack.
 err_code = nrf_sdh_ble_enable(&ram_start);
 APP_ERROR_CHECK(err_code);

 // Register a handler for BLE events.
 NRF_SDH_BLE_OBSERVER(m_ble_observer, APP_BLE_OBSERVER_PRIO, ble_evt_handler, NULL);
}
 
 I learned that I also have to increase both RAM_START and RAM_SIZE - according to this thread . 
 Those are the linker macros I had defined before increasing them, and they were working fine for a single service: FLASH_PH_START=0x0
FLASH_PH_SIZE=0x80000
RAM_PH_START=0x20000000
RAM_PH_SIZE=0x10000
FLASH_START=0x26000
FLASH_SIZE=0x5a000
RAM_START=0x20002b90
RAM_SIZE=0xd470 And this is after I added 1600 to RAM_START and RAM_SIZE: FLASH_PH_START=0x0 
FLASH_PH_SIZE=0x80000
RAM_PH_START=0x20000000
RAM_PH_SIZE=0x10000
FLASH_START=0x26000
FLASH_SIZE=0x5a000
RAM_START=0x200031D0
RAM_SIZE=0xdab0 
 
 I'm not sure what else I'm missing, but I still get the same error. 
 One other interesting thing I'm getting is that if I set ble_cfg.gatts_cfg.attr_tab_size.attr_tab_size = 2816, I get Error 7 (invalid parameter). I can only seem to be able to use values that are multiples of 100. Is it meant to be this way? Thanks