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Sensortile BlueNRG-MS, Adding custom bluetooth service

RADS1
Associate II
Posted on February 28, 2017 at 10:05

Hi,

I am working on Sensortile kit with the BlueNRG-MS radio.

As per ST document PM0237 section 3.3, pg 55/99, following commands are used to add custom service to BLE device :

//Add the service with service_uuid 128bits UUID

aci_gatt_add_serv(UUID_TYPE_

128, service_uuid, PRIMARY_SERVICE,

7

,&ServHandle);

//Add the characteristic with charUuid_1 128bits UUID

aci_gatt_add_char(ServHandle, UUID_TYPE_128, charUuid_1, 20,

CHAR_PROP_NOTIFY, ATTR_PERMISSION_NONE, 0,16, 1, &CharHandle_1);

//Add the characteristic with charUuid_2 128bits UUID

aci_gatt_add_char(ServHandle, UUID_TYPE_128, charUuid_2, 20,

CHAR_PROP_WRITE|CHAR_PROP_

WRITE_WITHOUT_RESP, ATTR_PERMISSION_NONE,

GATT_NOTIFY_ATTRIBUTE_WRITE,

16, 1, &CharHandle_2);

In above 7 indicates the maximum number of attribute records that can be added to this service. However, as per my understanding BlueNRG-MS always adds 6 mandatory attribute records in any custom service. So for above example, the maximum number of attribute records would be :

6(mandatory attribute records) + 1 (charUuid_1 attribute) + 1 (charUuid_2 attribute) = 8 attribute records

What is incorrect in the above calculated value of 8 as the maximum number of attribute records ? As 7 is used as the maximum number of attribute records in above example.

Any help on above would be appreciated.

1 REPLY 1
Posted on February 28, 2017 at 13:32

You may want to repost/share this question in

https://community.st.com/community/interface-and-connectivity-ics/content

 

JW