How LED ON at same time in Central connected to 3 ble peripheral.

Question

Hello, 
 I have developing one project in that i am using nRF52832 and SD 15.0. Here is the current application developing: 
 
 There are 3 ble app_blinky(ble peripheral) example operated on battery and it connected to multilink central. 
 Lets say ble peripheral name A, B, C and central device is master. 
 Each ble peripheral- A interface simply 2 push switch and whenever it press digital signal goes to connected central and then ON particular GPIO LED. 
 Same point two for other B and C ble peripheral. Therefore total LEDs on central side has 6 for each switch. 
 Now i am able to connect 3 ble peripheral to central but not able to ON particular LED controlled by ble peripheral slave. 
 
 Problems: 
 
 When switch press of device A , B or C then how i know in central whether it coming from A or B or C. I know connection handle link for each connection but i can do it will you please provide me program snippet for understanding. 
 Once all switches (Total 6) press at same time then it will wake up all 3 peripherals A, B and C connect to central device. Want to ON all 6 LEDs in central at same time frame. How i can do it. 
 
 Thanks......

Susheel Nuguru · Accepted Answer

1) on the central side, in the ble_evt_handler 
 void ble_evt_handler(ble_evt_t const * p_ble_evt, void * p_context)

You have uint16_t conn_handle = p_ble_evt->evt.gap_evt.conn_handle;

 
 This connection is unique per connection and you can use it to identify the peripheral logically. 
 2) Even though you press all the switches at the same time, the central will have to process them separately as each peripheral will send this notification to central separately. 
 For example, 
 if(the notification is for the LED service)
{
 if(conn_handle == 0x0 ) 
 {
 if(value == 1) LED_X_ON;
 else LED_X_OFF;
 }
 
 else if(conn_handle == 0x1 ) 
 {
 if(value == 1) LED_Y_ON;
 else LED_Y_OFF;
 }
 
 else if(conn_handle == 0x2 ) 
 {
 if(value == 1) LED_Z_ON;
 else LED_Z_OFF;
 }
} 
 I am just giving you a pseudo code to give you an idea.

How LED ON at same time in Central connected to 3 ble peripheral.

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