Is bas some base required service for all GATT apps or is there a hidden m_bas?

Question

Hi! 
 So I went from the Battery Service example to create my own service which went well and everything. Now I don't need a battery service, which is why I was trying to remove it. 
 I was able to rip out every single piece of code involving the battery service whilst the app still works 
 If I rip out those last lines: 
 memset(&bas_init, 0, sizeof(bas_init));

 // Here the sec level for the Battery Service can be changed/increased.
 BLE_GAP_CONN_SEC_MODE_SET_OPEN(&bas_init.battery_level_char_attr_md.cccd_write_perm);
 BLE_GAP_CONN_SEC_MODE_SET_OPEN(&bas_init.battery_level_char_attr_md.read_perm);
 BLE_GAP_CONN_SEC_MODE_SET_NO_ACCESS(&bas_init.battery_level_char_attr_md.write_perm);

 BLE_GAP_CONN_SEC_MODE_SET_OPEN(&bas_init.battery_level_report_read_perm);

 bas_init.evt_handler = NULL;
 bas_init.support_notification = true;
 bas_init.p_report_ref = NULL;
 bas_init.initial_batt_level = 100;

 err_code = ble_bas_init(&m_bas, &bas_init);
 APP_ERROR_CHECK(err_code);
 
 the app supposedly starts writing into memory that it is not allowed to. The characteristics will start displaying weird values and everything falls down until everything crashes ... 
 I verified with a grep that I am nowwhere else using the bas module: 
 Noahs-MacBook-Pro:src yatekii$ grep -r bas .
./cble.c:#include "ble_bas.h"
./cble.c: // The local database has likely changed, send service changed indications.
./cble.c: pm_local_database_has_changed();
./power_service.c: ble_uuid128_t base_uuid = APP_UUID;
./power_service.c: err_code = sd_ble_uuid_vs_add(&base_uuid, &ble_uuid.type);
./power_service.c: // Update databasee.
./services.c: ble_bas_init_t bas_init;
./services.c: memset(&bas_init, 0, sizeof(bas_init));
./services.c: BLE_GAP_CONN_SEC_MODE_SET_OPEN(&bas_init.battery_level_char_attr_md.cccd_write_perm);
./services.c: BLE_GAP_CONN_SEC_MODE_SET_OPEN(&bas_init.battery_level_char_attr_md.read_perm);
./services.c: BLE_GAP_CONN_SEC_MODE_SET_NO_ACCESS(&bas_init.battery_level_char_attr_md.write_perm);
./services.c: BLE_GAP_CONN_SEC_MODE_SET_OPEN(&bas_init.battery_level_report_read_perm);
./services.c: bas_init.evt_handler = NULL;
./services.c: bas_init.support_notification = true;
./services.c: bas_init.p_report_ref = NULL;
./services.c: bas_init.initial_batt_level = 100;
./services.c: //err_code = ble_bas_init(&m_bas, &bas_init);
 
 The absolutely weirdest part for me is that m_bas is non-existant in my code and the gcc does NOT complain. Which let's me guess that there is an m_bas somewhere hidden in the nordic code.
I tried to verify that with a grep too: 
 Noahs-MacBook-Pro:src yatekii$ grep -r m_bas .
./services.c: //err_code = ble_bas_init(&m_bas, &bas_init);
Noahs-MacBook-Pro:src yatekii$ grep -r m_bas ../inc/
Noahs-MacBook-Pro:src yatekii$
 
 Can somebody give me a hint on what I am doing wrong? 
 Sorry for asking such stupid things but it's driving me nuts ... 
 Best regards
Yatekii

Sigurd · Accepted Answer

Hi, 
 It could be that your phone has cached the old services. Try to add ble_enable_params.gatts_enable_params.service_changed = 1; in ble_stack_init() function: 
 .
.
ble_enable_params_t ble_enable_params;
err_code = softdevice_enable_get_default_config(NRF_BLE_CENTRAL_LINK_COUNT,
 NRF_BLE_PERIPHERAL_LINK_COUNT,
 &ble_enable_params);
ble_enable_params.gatts_enable_params.service_changed = 1; 
APP_ERROR_CHECK(err_code);
.
.
 
 If this doesn’t work, try to turn your phone off/on. If you still have the issue after this, please post the main.c code on GitHub gist and post the link here.