LM LM068 - Serial over GATT Service; Figure 8: Details of Services Provided on BLE Adapter

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User Manual for “LM068_BLE_Peri_0204” FW

Figure 8: Details of Services provided on BLE adapter

4.4 Serial over GATT service:

i. Serial communication with the BLE adapter can be performed using Serial-

Over-GATT-Service provided by CSR/Qualcomm with 128-bit UUID as

”0000-5500-d102-11e1-9b23-0002-5b00-a5a5”

ii. The above “Serial over GATT” service supports one characteristic with 128-

bit UUID as “0000-5501-d102-11e1-9b23-0002-5b00-a5a5”.

iii. This characteristic has properties as “Write command”, “Notify” and “Client

Configuration Flag”.

iv. The GAP central device sends data to BLE adapter using Write-WO-

Response command.

v. The BLE adapter sends data to Gap-Central device using Notifications

request.

vi. Before active data transmission starts on the BLE connection, Gap-Central

device should enable the Client-Configuration-Flag on BLE adapter, if this

flag is not enabled, Central or Peripheral device will not show the received

data.

vii. When BLE adapter receives data on its UART (to be sent to GAP-Central), it

sends the data in packets of 20 bytes after every 50mSec. BLE adapter

provides a 200 bytes internal buffer to store the data, when the buffer is