BLE S120 L2CAP Functions

Table of Contents

• 0xB0 - sd_ble_l2cap_cid_register
  • Function packet format
  • Response packet format
• 0xB1 - sd_ble_l2cap_cid_unregister
  • Function packet format
  • Response packet format
• 0xB2 - sd_ble_l2cap_tx
  • Function packet format
  • Response packet format

0xB0 - sd_ble_l2cap_cid_register

Function packet format

Frame format encoding of the sd_ble_l2cap_cid_register packet.

The parameters are encoded in the following order:

Length	Parameter	Value
1 byte	Operation Code	0xB0, see BLE_L2CAP_SVCS
2 bytes	CID	L2CAP CID

Figure 1: Packet format for sd_ble_l2cap_cid_register function.

Response packet format

Frame format encoding of the sd_ble_l2cap_cid_register response packet:

Length	Parameter	Value
1 byte	Operation Code	0xB0, see BLE_L2CAP_SVCS
4 bytes	nRF Error Code	See sd_ble_l2cap_cid_register

Figure 2: Packet format for sd_ble_l2cap_cid_register response.

0xB1 - sd_ble_l2cap_cid_unregister

Function packet format

Frame format encoding of the sd_ble_l2cap_cid_unregister packet.

The parameters are encoded in the following order:

Length	Parameter	Value
1 byte	Operation Code	0xB1, see BLE_L2CAP_SVCS
2 bytes	CID	L2CAP CID

Figure 1: Packet format for sd_ble_l2cap_cid_unregister function.

Response packet format

Frame format encoding of the sd_ble_l2cap_cid_unregister response packet:

Length	Parameter	Value
1 byte	Operation Code	0xB1, see BLE_L2CAP_SVCS
4 bytes	nRF Error Code	See sd_ble_l2cap_cid_unregister

Figure 2: Packet format for sd_ble_l2cap_cid_unregister response.

0xB2 - sd_ble_l2cap_tx

Function packet format

Frame format encoding of the sd_ble_l2cap_tx packet.

The parameters are encoded in the following order:

Length	Parameter	Value
1 byte	Operation Code	0xB2, see BLE_L2CAP_SVCS
2 bytes	Connection Handle	Handle value
1 byte	L2CAP Header present	0x00 - not present, 0x01 - present
3 bytes	Conditional: L2CAP Header	See ble_l2cap_header_t
1 byte	Data present	0x00 - not present, 0x01 - present
0...n bytes	Conditional: Data	Data to be transmitted

As can also be seen inside Figure 1, the 3 bytes inside ble_l2cap_header_t are encoded as:

Length	Parameter	Value
2 bytes	Length	See ble_l2cap_header_t::len
2 bytes	CID	See ble_l2cap_header_t::cid

Figure 1: Packet format for sd_ble_l2cap_tx function.

Response packet format

Frame format encoding of the sd_ble_l2cap_tx response packet:

Length	Parameter	Value
1 byte	Operation Code	0xB2, see BLE_L2CAP_SVCS
4 bytes	nRF Error Code	See sd_ble_l2cap_tx

Figure 2: Packet format for sd_ble_l2cap_tx response.