ERROR 12291 [Unknown error code]

Question

Hi All, 
 I have a question that when BLE connected it will show an error. 
 
 Accroding to the error,it show main.c : 163 have problem. 
 
 This is a characteristic in my custom service，I want it to use notify,so I reference battery service code. 
 Can anyone help me to review code? 
 
 SDK : 17.1.0 
 IDE : Segger 
 The attachment is my project, which contains customer service Header & C source 
 8053.test.zip

Einar Thorsrud · Accepted Answer

Hi, 
 The APP_ERROR_CHECK() on line 163 checks the return value of the call to ble_cs_error_check_update() on line 156, so you should debug inside that function to see what happens. For where within there does the return value 12291 (BLE_ERROR_INVALID_ATTR_HANDLE .) come from? Can you track it further? 
 Looking at the code I do not see that the handle has any sensible value: 
 hvx_params.handle = p_cs->error_char_handles.value_handle; 
 the above is never set, and so I expect this fails in your error_messages_send() where sd_ble_gatts_hvx() is called with a invalid handle. You should debug to validate. To fix this, ensure to add the characteristic properly. See this old post .

ERROR 12291 [Unknown error code]

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