Connecting to a GATT Server that has a custom 128 bit serrvice UUID

[ranger3]

Hi,

I'm following the gatt_client tutorial, and I need to modify the code to connect to a gatt server that is advertising a 128 bit custom service UUID.
I have added the required custom UUID in a define: -

Code: [Select all] [Expand/Collapse]

1. #define REMOTE_SERVICE_UUID         {0x12, 0x34, 0x56, 0x0E, 0x53, 0xF4, 0xF5, 0xA4, 0xAE, 0x42, 0xF9, 0x24, 0x12, 0x34, 0x56, 0xE8}
2. #define REMOTE_NOTIFY_CHAR_UUID     {0x89, 0x78, 0x12, 0x34, 0x53, 0xF4, 0xF5, 0xA4, 0xAE, 0x42, 0xF9, 0x24, 0x12, 0x34, 0x56, 0xE8}

GeSHi © Codebox Plus Extension

I've then modified the 'remote_filter_service_uuid' from the original: -

Code: [Select all] [Expand/Collapse]

1. static esp_bt_uuid_t remote_filter_service_uuid = {
2.     .len = ESP_UUID_LEN_16,
3.     .uuid = {.uuid16 = REMOTE_SERVICE_UUID,},
4. };
5.  
6. static esp_bt_uuid_t remote_filter_char_uuid = {
7.     .len = ESP_UUID_LEN_16,
8.     .uuid = {.uuid16 = REMOTE_NOTIFY_CHAR_UUID,},
9. };

GeSHi © Codebox Plus Extension

To this, using 128 bit instead of 16: -

Code: [Select all] [Expand/Collapse]

1. static esp_bt_uuid_t remote_filter_service_uuid = {
2.     .len = ESP_UUID_LEN_128,
3.     .uuid = {
4.         .uuid128 = REMOTE_SERVICE_UUID,
5.     },
6. };
7.  
8. static esp_bt_uuid_t remote_filter_char_uuid = {
9.     .len = ESP_UUID_LEN_128,
10.     .uuid = {
11.         .uuid128 = REMOTE_NOTIFY_CHAR_UUID,
12.     },
13. };

GeSHi © Codebox Plus Extension

The problem is it won't compile - it fails on the following line in the 'gattc_profile_event_handler' function: -

Code: [Select all] [Expand/Collapse]

1. if( p_data->search_res.srvc_id.uuid.uuid.uuid128 == REMOTE_SERVICE_UUID)

GeSHi © Codebox Plus Extension

With this error: -

Code: [Select all] [Expand/Collapse]

1. In function 'gattc_profile_event_handler':
2. ../components/ble_comms/ble_comms.c:37:37: error: expected expression before '{' token
3.  #define REMOTE_SERVICE_UUID         {0x12, 0x34, 0x56, 0x0E, 0x53, 0xF4, 0xF5, 0xA4, 0xAE, 0x42, 0xF9, 0x24, 0x12, 0x34, 0x56, 0xE8}
4.                                      ^
5. ../components/ble_comms/ble_comms.c:195:69: note: in expansion of macro 'REMOTE_SERVICE_UUID'
6.                  if( p_data->search_res.srvc_id.uuid.uuid.uuid128 == REMOTE_SERVICE_UUID)

GeSHi © Codebox Plus Extension

What am I missing? Any help would be greatly appreciated!

[chegewara]

You are trying to compare 2 arrays, it wont work this way. Easiest will be to use:

Code: Select all

memcmp()