Connection management (le_connection)#
The commands and events in this class are related to managing connection establishment, parameter setting, and disconnection procedures.
le_connection commands#
le_connection_close#
This command can be used to close a Bluetooth connection or cancel an ongoing connection establishment process. The parameter is a connection handle which is reported in le_connection_opened event or le_gap_connect response.
Command#
Byte | Type | Name | Description |
|---|---|---|---|
0 | 0x20 | hilen | Message type: Command |
1 | 0x01 | lolen | Minimum payload length |
2 | 0x08 | class | Message class:Connection management |
3 | 0x04 | method | Message ID |
4 | uint8 | connection | Handle of the connection to be closed |
Response#
Byte | Type | Name | Description |
|---|---|---|---|
0 | 0x20 | hilen | Message type: Response |
1 | 0x02 | lolen | Minimum payload length |
2 | 0x08 | class | Message class:Connection management |
3 | 0x04 | method | Message ID |
4-5 | uint16 | result | Result code |
0: success
Non-zero: an error occurred
For other values refer to the Error codes
API#
/* Function */
struct gecko_msg_le_connection_close_rsp_t *gecko_cmd_le_connection_close(uint8 connection);
/* Response id */
gecko_rsp_le_connection_close_id
/* Response structure */
struct gecko_msg_le_connection_close_rsp_t
{
uint16 result
} Events generated#
Event | Description |
|---|---|
le_connection_closed |
le_connection_disable_slave_latency#
This command temporarily enables or disables slave latency. Used only when Bluetooth device is in slave role.
Command#
Byte | Type | Name | Description |
|---|---|---|---|
0 | 0x20 | hilen | Message type: Command |
1 | 0x02 | lolen | Minimum payload length |
2 | 0x08 | class | Message class:Connection management |
3 | 0x02 | method | Message ID |
4 | uint8 | connection | Connection Handle |
5 | uint8 | disable | 0 enable, 1 disable slave latency |
Response#
Byte | Type | Name | Description |
|---|---|---|---|
0 | 0x20 | hilen | Message type: Response |
1 | 0x02 | lolen | Minimum payload length |
2 | 0x08 | class | Message class:Connection management |
3 | 0x02 | method | Message ID |
4-5 | uint16 | result | Result code |
0: success
Non-zero: an error occurred
For other values refer to the Error codes
API#
/* Function */
struct gecko_msg_le_connection_disable_slave_latency_rsp_t *gecko_cmd_le_connection_disable_slave_latency(uint8 connection, uint8 disable);
/* Response id */
gecko_rsp_le_connection_disable_slave_latency_id
/* Response structure */
struct gecko_msg_le_connection_disable_slave_latency_rsp_t
{
uint16 result
} le_connection_get_rssi#
This command can be used to get the latest RSSI value of a Bluetooth connection.
Command#
Byte | Type | Name | Description |
|---|---|---|---|
0 | 0x20 | hilen | Message type: Command |
1 | 0x01 | lolen | Minimum payload length |
2 | 0x08 | class | Message class:Connection management |
3 | 0x01 | method | Message ID |
4 | uint8 | connection | Connection handle |
Response#
Byte | Type | Name | Description |
|---|---|---|---|
0 | 0x20 | hilen | Message type: Response |
1 | 0x02 | lolen | Minimum payload length |
2 | 0x08 | class | Message class:Connection management |
3 | 0x01 | method | Message ID |
4-5 | uint16 | result | Result code |
0: success
Non-zero: an error occurred
For other values refer to the Error codes
API#
/* Function */
struct gecko_msg_le_connection_get_rssi_rsp_t *gecko_cmd_le_connection_get_rssi(uint8 connection);
/* Response id */
gecko_rsp_le_connection_get_rssi_id
/* Response structure */
struct gecko_msg_le_connection_get_rssi_rsp_t
{
uint16 result
} Events generated#
Event | Description |
|---|---|
le_connection_rssi | Triggered when this command has completed. |
le_connection_set_parameters#
This command can be used to request a change in the connection parameters of a Bluetooth connection.
Command#
Byte | Type | Name | Description |
|---|---|---|---|
0 | 0x20 | hilen | Message type: Command |
1 | 0x09 | lolen | Minimum payload length |
2 | 0x08 | class | Message class:Connection management |
3 | 0x00 | method | Message ID |
4 | uint8 | connection | Connection Handle |
5-6 | uint16 | min_interval | Minimum value for the connection event |
interval. This must be set be less than or equal to max_interval. |
Time = Value x 1.25 ms
Range: 0x0006 to 0x0c80
Time Range: 7.5 ms to 4 s
7-8 | uint16 | max_interval | Maximum value for the connection event interval. This must be set greater than or equal to min_interval.
Time = Value x 1.25 ms
Range: 0x0006 to 0x0c80
Time Range: 7.5 ms to 4 s
9-10 | uint16 | latency | Slave latency. This parameter defines how many connection intervals the slave can skip if it has no data to send
Range: 0x0000 to 0x01f4
Use 0x0000 for default value
11-12 | uint16 | timeout | Supervision timeout. The supervision timeout
defines for how long the connection is maintained despite the devices being
unable to communicate at the currently configured connection intervals.
Range: 0x000a to 0x0c80
Time = Value x 10 ms
Time Range: 100 ms to 32 s
The value in milliseconds must be larger than (1 + latency) max_interval 2, where max_interval is given in milliseconds
It is recommended that the supervision timeout is set at a value which allows communication attempts over at least a few connection intervals.
Response#
Byte | Type | Name | Description |
|---|---|---|---|
0 | 0x20 | hilen | Message type: Response |
1 | 0x02 | lolen | Minimum payload length |
2 | 0x08 | class | Message class:Connection management |
3 | 0x00 | method | Message ID |
4-5 | uint16 | result | Result code |
0: success
Non-zero: an error occurred
For other values refer to the Error codes
API#
/* Function */
struct gecko_msg_le_connection_set_parameters_rsp_t *gecko_cmd_le_connection_set_parameters(uint8 connection, uint16 min_interval, uint16 max_interval, uint16 latency, uint16 timeout);
/* Response id */
gecko_rsp_le_connection_set_parameters_id
/* Response structure */
struct gecko_msg_le_connection_set_parameters_rsp_t
{
uint16 result
} Events generated#
Event | Description |
|---|---|
le_connection_parameters | This event is triggered after new connection |
parameters has been applied on the connection. |
le_connection_set_phy#
This command can be used to set preferred PHYs for connection. Preferred PHYs are connection specific. Event le_connection_phy_status is received when PHY update procedure has been completed. Other than preferred PHY can also be set if remote device does not accept any of the preferred PHYs.
NOTE: 2 Mbit and Coded PHYs are not supported by all devices.
Command#
Byte | Type | Name | Description |
|---|---|---|---|
0 | 0x20 | hilen | Message type: Command |
1 | 0x02 | lolen | Minimum payload length |
2 | 0x08 | class | Message class:Connection management |
3 | 0x03 | method | Message ID |
4 | uint8 | connection | |
5 | uint8 | phy | Preferred PHYs for connection. This parameter is bitfield |
and multiple PHYs can be preferred by setting multiple bits. |
0x01: 1 Mbit PHY
0x02: 2 Mbit PHY
0x04: 125 kbit Coded PHY (S=8)
0x08: 500 kbit Coded PHY (S=2)
Response#
Byte | Type | Name | Description |
|---|---|---|---|
0 | 0x20 | hilen | Message type: Response |
1 | 0x02 | lolen | Minimum payload length |
2 | 0x08 | class | Message class:Connection management |
3 | 0x03 | method | Message ID |
4-5 | uint16 | result | Result code |
0: success
Non-zero: an error occurred
For other values refer to the Error codes
API#
/* Function */
struct gecko_msg_le_connection_set_phy_rsp_t *gecko_cmd_le_connection_set_phy(uint8 connection, uint8 phy);
/* Response id */
gecko_rsp_le_connection_set_phy_id
/* Response structure */
struct gecko_msg_le_connection_set_phy_rsp_t
{
uint16 result
} Events generated#
Event | Description |
|---|---|
le_connection_phy_status |
le_connection events#
le_connection_opened#
This event indicates that a new connection was opened, whether the devices are already bonded, and what is the role of the Bluetooth device (Slave or Master). An open connection can be closed with the le_connection_close command by giving the connection handle ID obtained from this event.
Event#
Byte | Type | Name | Description |
|---|---|---|---|
0 | 0xa0 | hilen | Message type: Event |
1 | 0x0b | lolen | Minimum payload length |
2 | 0x08 | class | Message class:Connection management |
3 | 0x00 | method | Message ID |
4-9 | bd_addr | address | Remote device address |
10 | uint8 | address_type | Remote device address type |
11 | uint8 | master | Device role in connection. Values: |
0: Slave
1: Master
12 | uint8 | connection | Handle for new connection
13 | uint8 | bonding | Bonding handle. Values:
0xff: No bonding
Other: Bonding handle
14 | uint8 | advertiser | The local advertising set this connection was opened to. Values:
0xff: Invalid value or not applicable, and this field should be ignored
Other: The advertising set handle
API#
/* event id*/
gecko_evt_le_connection_opened_id
/* event structure*/
struct gecko_msg_le_connection_opened_evt_t
{
bd_addr address,
uint8 address_type,
uint8 master,
uint8 connection,
uint8 bonding,
uint8 advertiser
} le_connection_closed#
This event indicates that a connection was closed.
Event#
Byte | Type | Name | Description |
|---|---|---|---|
0 | 0xa0 | hilen | Message type: Event |
1 | 0x03 | lolen | Minimum payload length |
2 | 0x08 | class | Message class:Connection management |
3 | 0x01 | method | Message ID |
4-5 | uint16 | reason | Result code |
0: success
Non-zero: an error occurred
For other values refer to the Error codes
6 | uint8 | connection | Handle of the closed connection
API#
/* event id*/
gecko_evt_le_connection_closed_id
/* event structure*/
struct gecko_msg_le_connection_closed_evt_t
{
uint16 reason,
uint8 connection
} le_connection_parameters#
This event is triggered whenever the connection parameters are changed and at any time a connection is established.
Event#
Byte | Type | Name | Description |
|---|---|---|---|
0 | 0xa0 | hilen | Message type: Event |
1 | 0x0a | lolen | Minimum payload length |
2 | 0x08 | class | Message class:Connection management |
3 | 0x02 | method | Message ID |
4 | uint8 | connection | Connection handle |
5-6 | uint16 | interval | Connection interval |
7-8 | uint16 | latency | Slave latency |
9-10 | uint16 | timeout | Supervision timeout |
11 | uint8 | security_mode | Connection security mode |
12-13 | uint16 | txsize | Maximum Data Channel PDU Payload size the |
controller can send in an air packet |
API#
/* event id*/
gecko_evt_le_connection_parameters_id
/* event structure*/
struct gecko_msg_le_connection_parameters_evt_t
{
uint8 connection,
uint16 interval,
uint16 latency,
uint16 timeout,
uint8 security_mode,
uint16 txsize
} le_connection_rssi#
This event is triggered when an le_connection_get_rssi command has completed.
Event#
Byte | Type | Name | Description |
|---|---|---|---|
0 | 0xa0 | hilen | Message type: Event |
1 | 0x03 | lolen | Minimum payload length |
2 | 0x08 | class | Message class:Connection management |
3 | 0x03 | method | Message ID |
4 | uint8 | connection | Connection handle |
5 | uint8 | status | Command complete status: |
0x00: The command succeeded
0x01-0xFF: The command failed. See Bluetooth Core specification v5.0 [Vol 2] Part D, Error Codes
6 | int8 | rssi | RSSI in the latest received packet of the connection. Units: dBm.
Range: -127 to +20
This parameter should be ignored if the command failed.
API#
/* event id*/
gecko_evt_le_connection_rssi_id
/* event structure*/
struct gecko_msg_le_connection_rssi_evt_t
{
uint8 connection,
uint8 status,
int8 rssi
} le_connection_phy_status#
This event indicates that PHY update procedure has been completed.
Event#
Byte | Type | Name | Description |
|---|---|---|---|
0 | 0xa0 | hilen | Message type: Event |
1 | 0x02 | lolen | Minimum payload length |
2 | 0x08 | class | Message class:Connection management |
3 | 0x04 | method | Message ID |
4 | uint8 | connection | Connection handle |
5 | uint8 | phy | Current active PHY. See values from le_connection_set_phy |
command. |
API#
/* event id*/
gecko_evt_le_connection_phy_status_id
/* event structure*/
struct gecko_msg_le_connection_phy_status_evt_t
{
uint8 connection,
uint8 phy
} le_connection enumerations#
le_connection_security#
These values indicate the Bluetooth Security Mode.
Enumerations#
Value | Name | Description |
|---|---|---|
0 | le_connection_mode1_level1 | No security |
1 | le_connection_mode1_level2 | Unauthenticated pairing with encryption |
2 | le_connection_mode1_level3 | Authenticated pairing with encryption |
3 | le_connection_mode1_level4 | Authenticated Secure Connections pairing with |
encryption using a 128-bit strength encryption key |