Connection
Connection.
Modules | |
Transmit Power Reporting Constants | |
sl_bt_evt_connection_opened | |
Indicates that a new connection was opened. | |
sl_bt_evt_connection_parameters | |
Triggered whenever the connection parameters are changed and at any time a connection is established. | |
sl_bt_evt_connection_phy_status | |
Indicates that PHY update procedure is completed. | |
sl_bt_evt_connection_rssi | |
Triggered when an connection_get_rssi command has completed. | |
sl_bt_evt_connection_get_remote_tx_power_completed | |
Indicates that reading remote transmit power initiated by sl_bt_connection_get_remote_tx_power command has completed. | |
sl_bt_evt_connection_tx_power | |
Reports a transmit power change on the local device of a connection if transmit power reporting has been enabled. | |
sl_bt_evt_connection_remote_tx_power | |
Reports a transmit power change on the remote device of a connection if transmit power reporting has been enabled. | |
sl_bt_evt_connection_closed | |
Indicates that a connection was closed. | |
sl_bt_evt_connection_remote_used_features | |
List of link layer features supported by the remote device. | |
Enumerations | |
enum | sl_bt_connection_security_t { sl_bt_connection_mode1_level1 = 0x0, sl_bt_connection_mode1_level2 = 0x1, sl_bt_connection_mode1_level3 = 0x2, sl_bt_connection_mode1_level4 = 0x3 } |
Indicate the Bluetooth Security Mode. | |
enum | sl_bt_connection_power_reporting_mode_t { sl_bt_connection_power_reporting_disable = 0x0, sl_bt_connection_power_reporting_enable = 0x1 } |
These values define transmit power reporting modes in LE power control. | |
enum | sl_bt_connection_tx_power_flag_t { sl_bt_connection_tx_power_flag_none = 0x0, sl_bt_connection_tx_power_at_minimum = 0x1, sl_bt_connection_tx_power_at_maximum = 0x2 } |
This enum defines the flag values for a reported transmit power level. | |
Functions | |
sl_status_t | sl_bt_connection_set_default_parameters (uint16_t min_interval, uint16_t max_interval, uint16_t latency, uint16_t timeout, uint16_t min_ce_length, uint16_t max_ce_length) |
sl_status_t | sl_bt_connection_set_default_preferred_phy (uint8_t preferred_phy, uint8_t accepted_phy) |
sl_status_t | sl_bt_connection_open (bd_addr address, uint8_t address_type, uint8_t initiating_phy, uint8_t *connection) |
sl_status_t | sl_bt_connection_set_parameters (uint8_t connection, uint16_t min_interval, uint16_t max_interval, uint16_t latency, uint16_t timeout, uint16_t min_ce_length, uint16_t max_ce_length) |
sl_status_t | sl_bt_connection_set_preferred_phy (uint8_t connection, uint8_t preferred_phy, uint8_t accepted_phy) |
sl_status_t | sl_bt_connection_disable_slave_latency (uint8_t connection, uint8_t disable) |
sl_status_t | sl_bt_connection_get_rssi (uint8_t connection) |
sl_status_t | sl_bt_connection_read_channel_map (uint8_t connection, size_t max_channel_map_size, size_t *channel_map_len, uint8_t *channel_map) |
sl_status_t | sl_bt_connection_set_power_reporting (uint8_t connection, uint8_t mode) |
sl_status_t | sl_bt_connection_set_remote_power_reporting (uint8_t connection, uint8_t mode) |
sl_status_t | sl_bt_connection_get_tx_power (uint8_t connection, uint8_t phy, int8_t *current_level, int8_t *max_level) |
sl_status_t | sl_bt_connection_get_remote_tx_power (uint8_t connection, uint8_t phy) |
sl_status_t | sl_bt_connection_close (uint8_t connection) |
sl_status_t | sl_bt_connection_read_remote_used_features (uint8_t connection) |
Detailed Description
Connection.
The commands and events in this class are related to managing connection establishment, parameter setting, and disconnection procedures.
Enumeration Type Documentation
◆ sl_bt_connection_security_t
Indicate the Bluetooth Security Mode.
◆ sl_bt_connection_power_reporting_mode_t
◆ sl_bt_connection_tx_power_flag_t
This enum defines the flag values for a reported transmit power level.
Function Documentation
◆ sl_bt_connection_set_default_parameters()
sl_status_t sl_bt_connection_set_default_parameters | ( | uint16_t | min_interval, |
uint16_t | max_interval, |
||
uint16_t | latency, |
||
uint16_t | timeout, |
||
uint16_t | min_ce_length, |
||
uint16_t | max_ce_length |
||
) |
Set default Bluetooth connection parameters. The values are valid for all subsequent connections initiated by this device. To change parameters of an already established connection, use the command sl_bt_connection_set_parameters.
- Parameters
-
[in] min_interval
Minimum value for the connection event interval. This must be set 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
Default value: 20 ms
[in] 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
Default value: 50 ms
[in] latency
Peripheral latency, which defines how many connection intervals the peripheral can skip if it has no data to send
- Range: 0x0000 to 0x01f3
Default value: 0
[in] timeout
Supervision timeout, which defines the time that the connection is maintained although the devices can't 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, wheremax_interval
is given in milliseconds
Set the supervision timeout at a value which allows communication attempts over at least a few connection intervals.
Default value: 1000 ms
[in] min_ce_length
Minimum value for the connection event length. This must be set be less than or equal to
max_ce_length
.- Time = Value x 0.625 ms
- Range: 0x0000 to 0xffff
Default value: 0x0000
Value is not currently used and is reserved for future. Set to 0.
[in] max_ce_length
Maximum value for the connection event length. This must be set greater than or equal to
min_ce_length
.- Time = Value x 0.625 ms
- Range: 0x0000 to 0xffff
Default value: 0xffff
- Returns
- SL_STATUS_OK if successful. Error code otherwise.
◆ sl_bt_connection_set_default_preferred_phy()
sl_status_t sl_bt_connection_set_default_preferred_phy | ( | uint8_t | preferred_phy, |
uint8_t | accepted_phy |
||
) |
Set default preferred and accepted PHYs. PHY settings will be used for all subsequent connections. Non-preferred PHY can also be set if the remote device does not accept any of the preferred PHYs.
The parameter accepted_phy
is used to specify PHYs that the stack can accept in a remotely-initiated PHY update request. A PHY update will not happen if none of the accepted PHYs are present in the request.
NOTE: 2M and Coded PHYs are not supported by all devices.
- Parameters
-
[in] preferred_phy
Preferred PHYs. This parameter is a bitfield and multiple PHYs can be set.
- 0x01: 1M PHY
- 0x02: 2M PHY
- 0x04: Coded PHY
- 0xff: Any PHYs
Default: 0xff (no preference)
[in] accepted_phy
Accepted PHYs in remotely-initiated PHY update request. This parameter is a bitfield and multiple PHYs can be set.
- 0x01: 1M PHY
- 0x02: 2M PHY
- 0x04: Coded PHY
- 0xff: Any PHYs
Default: 0xff (all PHYs accepted)
- Returns
- SL_STATUS_OK if successful. Error code otherwise.
◆ sl_bt_connection_open()
sl_status_t sl_bt_connection_open | ( | bd_addr | address, |
uint8_t | address_type, |
||
uint8_t | initiating_phy, |
||
uint8_t * | connection |
||
) |
Connect to an advertising device with the specified initiating PHY on which connectable advertisements on primary advertising channels are received. The Bluetooth stack will enter a state where it continuously scans for the connectable advertising packets from the remote device, which matches the Bluetooth address given as a parameter. Scan parameters set in sl_bt_scanner_set_timing are used in this operation. Upon receiving the advertising packet, the module will send a connection request packet to the target device to initiate a Bluetooth connection. To cancel an ongoing connection process, use sl_bt_connection_close command with the handle received in response from this command.
A connection is opened in no-security mode. If the GATT client needs to read or write the attributes on GATT server requiring encryption or authentication, it must first encrypt the connection using an appropriate authentication method.
If a connection can't be established, for example, the remote device has gone out of range, has entered into deep sleep, or is not advertising, the stack will try to connect forever. In this case, the application will not get an event related to the connection request. To recover from this situation, the application can implement a timeout and call sl_bt_connection_close to cancel the connection request.
This command fails with the connection limit exceeded error if the number of connections attempted exceeds the configured MAX_CONNECTIONS value.
This command fails with the invalid parameter error if the initiating PHY value is invalid or the device does not support PHY.
Subsequent calls of this command have to wait for the ongoing command to complete. A received event sl_bt_evt_connection_opened indicates that the connection opened successfully and a received event sl_bt_evt_connection_closed indicates that connection failures have occurred.
- Parameters
-
[in] address
Address of the device to connect to [in] address_type
Enum sl_bt_gap_address_type_t. Address type of the device to connect to. Values: - sl_bt_gap_public_address (0x0): Public device address
- sl_bt_gap_static_address (0x1): Static device address
- sl_bt_gap_random_resolvable_address (0x2): Resolvable private random address
- sl_bt_gap_random_nonresolvable_address (0x3): Non-resolvable private random address
[in] initiating_phy
Enum sl_bt_gap_phy_t. The initiating PHY. Values: - sl_bt_gap_phy_1m (0x1): 1M PHY
- sl_bt_gap_phy_coded (0x4): Coded PHY, 125k (S=8) or 500k (S=2)
[out] connection
Handle that will be assigned to the connection after the connection is established. This handle is valid only if the result code of this response is 0 (zero).
- Returns
- SL_STATUS_OK if successful. Error code otherwise.
Events
- sl_bt_evt_connection_opened - This event is triggered after the connection is opened and indicates whether the devices are already bonded and the role of the device in this connection.
- sl_bt_evt_connection_parameters - This event indicates the connection parameters and security mode of the connection.
◆ sl_bt_connection_set_parameters()
sl_status_t sl_bt_connection_set_parameters | ( | uint8_t | connection, |
uint16_t | min_interval, |
||
uint16_t | max_interval, |
||
uint16_t | latency, |
||
uint16_t | timeout, |
||
uint16_t | min_ce_length, |
||
uint16_t | max_ce_length |
||
) |
Request a change in the connection parameters of a Bluetooth connection.
- Parameters
-
[in] connection
Connection Handle [in] min_interval
Minimum value for the connection event interval. This must be set 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
[in] 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
[in] latency
Peripheral latency, which defines how many connection intervals the peripheral can skip if it has no data to send - Range: 0x0000 to 0x01f3
[in] timeout
Supervision timeout, which defines the time that the connection is maintained although the devices can't 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, wheremax_interval
is given in milliseconds
Set the supervision timeout at a value which allows communication attempts over at least a few connection intervals.
[in] min_ce_length
Minimum value for the connection event length. This must be set less than or equal to
max_ce_length
.- Time = Value x 0.625 ms
- Range: 0x0000 to 0xffff
Value is not currently used and is reserved for future. Set to 0.
[in] max_ce_length
Maximum value for the connection event length. This must be set greater than or equal to
min_ce_length
.- Time = Value x 0.625 ms
- Range: 0x0000 to 0xffff
Use 0xffff for no limitation.
- Returns
- SL_STATUS_OK if successful. Error code otherwise.
Events
- sl_bt_evt_connection_parameters - Triggered after new connection parameters are applied on the connection.
◆ sl_bt_connection_set_preferred_phy()
sl_status_t sl_bt_connection_set_preferred_phy | ( | uint8_t | connection, |
uint8_t | preferred_phy, |
||
uint8_t | accepted_phy |
||
) |
Set preferred and accepted PHYs for a given connection. Event sl_bt_evt_connection_phy_status is received when PHY update procedure is completed. Non-preferred PHY can also be set if remote device does not accept any of the preferred PHYs.
The parameter accepted_phy
is used for specifying the PHYs that the stack can accept in a remote initiated PHY update request. A PHY update will not occur if none of the accepted PHYs presents in the request.
NOTE: 2M and Coded PHYs are not supported by all devices.
- Parameters
-
[in] connection
Connection handle [in] preferred_phy
Preferred PHYs. This parameter is a bitfield and multiple PHYs can be set.
- 0x01: 1M PHY
- 0x02: 2M PHY
- 0x04: 125k Coded PHY (S=8)
- 0x08: 500k Coded PHY (S=2)
Default: 0xff (no preference)
[in] accepted_phy
Accepted PHYs in remotely-initiated PHY update requests. This parameter is a bitfield and multiple PHYs can be set.
- 0x01: 1M PHY
- 0x02: 2M PHY
- 0x04: Coded PHY
- 0xff: Any PHYs
Default: 0xff (all PHYs accepted)
- Returns
- SL_STATUS_OK if successful. Error code otherwise.
Events
◆ sl_bt_connection_disable_slave_latency()
sl_status_t sl_bt_connection_disable_slave_latency | ( | uint8_t | connection, |
uint8_t | disable |
||
) |
Temporarily enable or disable peripheral latency. Used only when Bluetooth device is acting as a peripheral. When peripheral latency is disabled, the peripheral latency connection parameter is not set to 0 but the device will wake up on every connection interval to receive and send packets.
- Parameters
-
[in] connection
Connection Handle [in] disable
0 enable, 1 disable peripheral latency. Default: 0
- Returns
- SL_STATUS_OK if successful. Error code otherwise.
◆ sl_bt_connection_get_rssi()
sl_status_t sl_bt_connection_get_rssi | ( | uint8_t | connection | ) |
Get the latest RSSI value of a Bluetooth connection. The RSSI value will be reported in a sl_bt_evt_connection_rssi event.
- Parameters
-
[in] connection
Connection handle
- Returns
- SL_STATUS_OK if successful. Error code otherwise.
Events
- sl_bt_evt_connection_rssi - Triggered when this command has completed.
◆ sl_bt_connection_read_channel_map()
sl_status_t sl_bt_connection_read_channel_map | ( | uint8_t | connection, |
size_t | max_channel_map_size, |
||
size_t * | channel_map_len, |
||
uint8_t * | channel_map |
||
) |
Read channel map for a specified connection.
- Parameters
-
[in] connection
Connection Handle [in] max_channel_map_size
Size of output buffer passed in channel_map
[out] channel_map_len
On return, set to the length of output data written to channel_map
[out] channel_map
This parameter is 5 bytes and contains 37 1-bit fields. The nth field (in the range 0 to 36) contains the value for the link layer channel index n.
- 0: Channel n is unused.
- 1: Channel n is used.
The most significant bits are reserved for future use.
- Returns
- SL_STATUS_OK if successful. Error code otherwise.
◆ sl_bt_connection_set_power_reporting()
sl_status_t sl_bt_connection_set_power_reporting | ( | uint8_t | connection, |
uint8_t | mode |
||
) |
Enable or disable the transmit power reporting for the local device on a connection. When transmit power reporting is enabled, event sl_bt_evt_connection_tx_power is generated when transmit power on the local device changes.
By default, power reporting for local device is enabled.
- Parameters
-
[in] connection
Handle of the connection [in] mode
Enum sl_bt_connection_power_reporting_mode_t. Transmit power reporting mode. Values: - sl_bt_connection_power_reporting_disable (0x0): Disable transmit power reporting
- sl_bt_connection_power_reporting_enable (0x1): Enable transmit power reporting
- Returns
- SL_STATUS_OK if successful. Error code otherwise.
Events
◆ sl_bt_connection_set_remote_power_reporting()
sl_status_t sl_bt_connection_set_remote_power_reporting | ( | uint8_t | connection, |
uint8_t | mode |
||
) |
Enable or disable the transmit power reporting for the remote device on a connection. When transmit power reporting is enabled, event sl_bt_evt_connection_remote_tx_power is generated when transmit power on the remote device changes.
By default, power reporting for the remote device is disabled.
- Parameters
-
[in] connection
Handle of the connection [in] mode
Enum sl_bt_connection_power_reporting_mode_t. Transmit power reporting mode. Values: - sl_bt_connection_power_reporting_disable (0x0): Disable transmit power reporting
- sl_bt_connection_power_reporting_enable (0x1): Enable transmit power reporting
- Returns
- SL_STATUS_OK if successful. Error code otherwise.
Events
◆ sl_bt_connection_get_tx_power()
sl_status_t sl_bt_connection_get_tx_power | ( | uint8_t | connection, |
uint8_t | phy, |
||
int8_t * | current_level, |
||
int8_t * | max_level |
||
) |
Get the transmit power of the local device on the given connection and PHY.
- Parameters
-
[in] connection
Handle of the connection [in] phy
Enum sl_bt_gap_phy_coding_t. The PHY. Values: - sl_bt_gap_phy_coding_1m_uncoded (0x1): 1M PHY
- sl_bt_gap_phy_coding_2m_uncoded (0x2): 2M PHY
- sl_bt_gap_phy_coding_125k_coded (0x4): 125k Coded PHY (S=8)
- sl_bt_gap_phy_coding_500k_coded (0x8): 500k Coded PHY (S=2)
[out] current_level
The current transmit power level of the PHY on the connection. Values: - Range -127 to 20: The transmit power level in dBm
- SL_BT_CONNECTION_TX_POWER_UNAVAILABLE (0x7F): Transmit power level is not available.
[out] max_level
The maximum transmit power level of the PHY on the connection. Values: Range -127 to +20 in dBm.
- Returns
- SL_STATUS_OK if successful. Error code otherwise.
◆ sl_bt_connection_get_remote_tx_power()
sl_status_t sl_bt_connection_get_remote_tx_power | ( | uint8_t | connection, |
uint8_t | phy |
||
) |
Get the transmit power of the remote device on the given connection and PHY. Transmit power levels are returned in event sl_bt_evt_connection_get_remote_tx_power_completed after the operation completed.
- Parameters
-
[in] connection
Handle of the connection [in] phy
Enum sl_bt_gap_phy_coding_t. The PHY. Values: - sl_bt_gap_phy_coding_1m_uncoded (0x1): 1M PHY
- sl_bt_gap_phy_coding_2m_uncoded (0x2): 2M PHY
- sl_bt_gap_phy_coding_125k_coded (0x4): 125k Coded PHY (S=8)
- sl_bt_gap_phy_coding_500k_coded (0x8): 500k Coded PHY (S=2)
- Returns
- SL_STATUS_OK if successful. Error code otherwise.
Events
◆ sl_bt_connection_close()
sl_status_t sl_bt_connection_close | ( | uint8_t | connection | ) |
Close a Bluetooth connection or cancel an ongoing connection establishment process. The parameter is a connection handle which is reported in sl_bt_evt_connection_opened event or sl_bt_connection_open command response.
- Parameters
-
[in] connection
Handle of the connection to be closed
- Returns
- SL_STATUS_OK if successful. Error code otherwise.
Events
◆ sl_bt_connection_read_remote_used_features()
sl_status_t sl_bt_connection_read_remote_used_features | ( | uint8_t | connection | ) |
Read link layer features supported by the remote device.
- Parameters
-
[in] connection
Connection Handle
- Returns
- SL_STATUS_OK if successful. Error code otherwise.
Events