BLEConnect Class

BLEConnect Class

Description
A class used for managing BLE connection settings.

Syntax
class BLEConnect

Members

Public Constructors
No public constructor is available as this class is intended to be a singleton class. You can get a pointer to this class using BLEDevice::configConnection.
Public Methods 
BLEConnect::connectScan and search for all accessible BLE devices, then select and connect to one of them.
BLEConnect::disconnectDisconnect from targeted BLE device.
BLEConnect::setScanIntervalSet the scan interval when searching for the targeted device.
BLEConnect::setScanWindowSet the BLE scan window when searching for the targeted device to connect to.
BLEConnect::setConnIntervalSet the BLE connection interval duration.
BLEConnect::setConnLatencySet the BLE connection slave latency value.
BLEConnect::setConnTimeoutSet the BLE connection timeout value.
BLEConnect::updateConnParamsUpdate a connected device with new connection parameters.
BLEConnect::getConnInfoGet connection information.
BLEConnect::getConnAddrGet the Bluetooth address for a certain connection.
BLEConnect::getConnIdGet the connection ID for a certain device.

BLEConnect::connect

Description
This class function is used to scan and search for all accessible BLE devices, then select and connect to one of them.

Syntax
bool connect(char* btAddr, T_GAP_REMOTE_ADDR_TYPE destAddrType, uint16_t scanTimeout);
bool connect(uint8_t (&btAddr)[6], T_GAP_REMOTE_ADDR_TYPE destAddrType, uint16_t scanTimeout);
bool connect(BLEAdvertData targetDevice, uint16_t scanTimeout);
bool connect(BLEAddr destAddr, T_GAP_REMOTE_ADDR_TYPE destAddrType, uint16_t scanTimeout);

Parameters
char* btAddr: pointer to the targeted BLE device’s Bluetooth address expressed as a character string.
uint8_t (&btAddr): targeted BLE device’s Bluetooth address stored in a 6-byte array.
destAddr: targeted BLE device’s Bluetooth address contained in BLEAddr class object.
targetDevice: advertising data packet scanned from targeted BLE device.
destAddrType: Bluetooth address type of targeted BLE device, Valid values:
– GAP_REMOTE_ADDR_LE_PUBLIC
– GAP_REMOTE_ADDR_LE_RANDOM
scan timeout: duration in milliseconds for which to look for the targeted BLE device before giving up.

Returns
This function returns true if the connection is successful, otherwise false.

Example Code
Example: BLEBatteryClient
(https://github.com/ambiot/ambd_arduino/blob/dev/Arduino_package/hardware/libraries/BLE/examples/BLEBatteryClient/BLEBatteryClient.ino)

Notes and Warnings
“BLEConnect.h” must be included to use the class function.

BLEConnect::disconnect

Description
Disconnect from targeted BLE device.

Syntax
bool disconnect(uint8_t connId = 0);

Parameters
connId: connection ID for target device. Default connection ID set to 0.

Returns
This function returns true if the operation is successful, otherwise false.

Example Code
NA

Notes and Warnings
“BLEConnect.h” must be included to use the class function.

BLEConnect::setScanInterval

Description
Set the scan interval when searching for the targeted device.

Syntax
void setScanInterval(uint16_t scanInt_ms);

Parameters
scanInt_ms: scan interval in milliseconds. Valid value: 3 to 10240.

Returns
NA

Example Code
NA

Notes and Warnings
Scan interval defines how often the scanner is launched. The value set for scanInt_ms must be equal or larger than the value set for scanWindow_ms. scanInt_ms value is defined in units of 625 microseconds.
“BLEConnect.h” must be included to use the class function.

BLEConnect::setScanWindow

Description
Set the BLE scan window when searching for the targeted device to connect to.

Syntax
void setScanWindow(uint16_t scanWindow_ms);

Parameters
scanWindow_ms: scan window in milliseconds. Valid value: 3 to 10240.

Returns
NA

Example Code
NA

Notes and Warnings
BLE scan window defines how long each interval should be scanned for. The value set for scanWindow_ms set must be equal or smaller than the value set for scanInt_ms. scanWindow_ms value is defined in units of 625 microseconds.
“BLEConnect.h” must be included to use the class function.

BLEConnect::setConnInterval

Description
Set the BLE connection interval duration.

Syntax
void setConnInterval(uint16_t min_ms, uint16_t max_ms);

Parameters
min_ms: minimum acceptable connection interval in milliseconds. Valid value: 8 to 4000.
max_ms: maximum acceptable connection interval in milliseconds. Valid value: 8 to 4000.

Returns
NA

Example Code
NA

Notes and Warnings
The BLE connection interval defines the period between successive connection events between a connected central and peripheral device. Even if there is no data to exchange, a connection event is required to maintain the connection. max_ms should be larger than or equal to min_ms.
“BLEConnect.h” must be included to use the class function.

BLEConnect::setConnLatency

Description
Set the BLE connection slave latency value.

Syntax
void setConnLatency(uint16_t latency);

Parameters
latency: Connection slave latency value. Valid value: 0 to 499.

Returns
NA

Example Code
NA

Notes and Warnings
The BLE connection slave latency defines the number of successive connection events a connected peripheral device can ignore without being considered as disconnected by the central device.
“BLEConnect.h” must be included to use the class function.

BLEConnect::setConnTimeout

Description
Set the BLE connection timeout value.

Syntax
void setConnTimeout(uint16_t timeout_ms);

Parameters
timeout_ms: connection timeout in milliseconds.
Valid value: 100 to 32000.

Returns
NA

Example Code
NA

Notes and Warnings
The BLE connection timeout defines the duration a peripheral or central device must wait after a failed connection to consider the connection broken.
“BLEConnect.h” must be included to use the class function.

BLEConnect::updateConnParams

Description
Update a connected device with new connection parameters.

Syntax
void updateConnParams(uint8_t conn_id);

Parameters
conn_id: connection ID of targeted device to update connection parameters.

Returns
NA

Example Code
NA

Notes and Warnings
Update the connected device with new connection parameters such as connection interval, slave latency and timeout values. The connected device may reject the new values if it is unable to conform to them.
“BLEConnect.h” must be included to use the class function.

BLEConnect::getConnInfo

Description
Get connection information.

Syntax
bool getConnInfo(uint8_t connId, T_GAP_CONN_INFO *pConnInfo);

Parameters
connId: connection ID to get connection information from.
pConnInfo: pointer to T_GAP_CONN_INFO structure to store obtained connection information.

Returns
This function returns true if the connection information is successfully obtained. Otherwise, false.

Example Code
NA

Notes and Warnings
“BLEConnect.h” must be included to use the class function.

BLEConnect::getConnAddr

Description
Get the Bluetooth address for a certain connection.

Syntax
bool getConnAddr(uint8_t connId, uint8_t* addr, uint8_t* addrType);

Parameters
connId: connection ID to get address information for.
addr: pointer to 6 byte array to store retrieved Bluetooth address.
addrType: pointer to uint8_t variable to store retrieved Bluetooth address type.

Returns
This function returns true if the connection address information is successfully obtained. Otherwise, false.

Example Code
NA

Notes and Warnings
“BLEConnect.h” must be included to use the class function.

BLEConnect::getConnId

Description
Get the connection ID for a certain device.

Syntax
int8_t getConnId(char* btAddr, uint8_t addrType);
int8_t getConnId(uint8_t* btAddr, uint8_t addrType);
int8_t getConnId(BLEAdvertData targetDevice);

Parameters
char* btAddr: targeted device Bluetooth address expressed as a character string.
uint8_t* btAddr: pointer to a 6-byte array containing targeted device Bluetooth address.
targetDevice: advertising data packet scanned from targeted device.
addrType: Bluetooth address type of targeted device. Valid values:
– GAP_REMOTE_ADDR_LE_PUBLIC
– GAP_REMOTE_ADDR_LE_RANDOM

Returns
This function returns the requested connection ID. Else, returns -1 if failed to obtain connection ID.

Example Code
Example: BLEBatteryClient
(https://github.com/ambiot/ambd_arduino/blob/dev/Arduino_package/hardware/libraries/BLE/examples/BLEBatteryClient/BLEBatteryClient.ino)

Notes and Warnings
“BLEConnect.h” must be included to use the class function.

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