PM0237 datasheet(83/88 Pages) STMICROELECTRONICS

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PM0237

Design an application using BlueNRG, BlueNRG-MS ACI APIs

Slave_Conn_Interval_Max = 0x0008)

Since Master&Slave device is also acting as a Central device, it receives the

EVT_BLUE_GATT_NOTIFICATION event related to the characteristics values notified

from, respectively, Slave_A and Slave_B devices.

Once Master&Slave device enters in discovery mode, it also waits for connection

request coming from the other BlueNRG-MS device (called Master) configured as

GAP Central. Master device starts discovery procedure for discovering the

Master&Slave device:

ret = aci_gap_start_gen_disc_proc (LE_Scan_Interval=0x10,

LE_Scan_Window=0x10)

Master&Slave device is discovered thorugh the EVT_LE_ADVERTISING_REPORT event.

10. Once the Master&Slave device is discovered, Master device starts a connection

procedure for connecting to it :

/* Master device connects to Master&Slave device: Master&Slave addreess

type and address have been found during the discovery procedure within the

EVT_LE_ADVERTISING_REPORT event */

ret= aci_gap_create_connection(LE_Scan_Interval=0x0010,

LE_Scan_Window=0x0010,

Peer_Address_Type= ”Master&Slave address

type”

Peer_Address= ”Master&Slave address”

Conn_Interval_Min=0x6c,

Conn_Interval_Max=0x6c,

Conn_Latency=0x00,

Supervision_Timeout=0xc80,

Minimum_CE_Length=0x000c,

Maximum_CE_Length=0x000c)

11. Once connected, Master device enables the characteristic notification on

Master&Slave device using the aci_gatt_write_charac_descriptor() API.

12. At this stage, Master&Slave device receives the characteristics notifications from

both Slave_A, Slave_B devices , since it is a GAP Central and, as GAP Peripheral, it is

also able to notify these characteristics values to the Master device.

Note:

A set of test scripts allowing to exercise the described BlueNRG-MS simultaneously Master,

Slave scenario are provided within the BlueNRG DK SW package (see Reference Section).

These scripts can be run using the BlueNRG GUI and they can be taken as reference for

implementing a firmware application using the BlueNRG-MS simultaneously master and

slave feature.

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