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Communication / Bluetooth Low Energy:

» BLE 06 Configuring a connection

This example configures the parameters involved when connecting to a slave. It performs a device scan and if detected, it connects to the BLE module with the selected paramenters.

Required Materials

1 x Waspmote
1 x Battery
1 x Bluetooth Low Energy module
1 x Bluetooth module antenna
1 x Expansion board (if socket 1 is used)
1 x SD card

Notes

Socket 0 is used by default
EEPROM is used in this example by default.
Never unplug module while Waspmote is turned ON.
Bluetooth module antenna should be connected.
The battery must be connected in ANY example.

Code

/*
 *  ------------------ [BLE_06] - Configuring a connection ------------------- 
 *
 *  Explanation: This example configures the parameters involved when 
 *  connecting to a slave. It performs a device scan and if detected, 
 *  it connects to the BLE module with the selected parameters.
 *
 *  Copyright (C) 2014 Libelium Comunicaciones Distribuidas S.L.
 *  http://www.libelium.com
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 * 
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS ARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 * 
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 *  Version:		0.1
 *  Design:		David Gascón
 *  Implementation:	Javier Siscart
 */

#include <WaspBLE.h>

// Auxiliary variable
uint8_t aux = 0;

// MAC address of BLE device to find
char MAC[14] = "0007804aa902";

// Now define connection parameters
const uint16_t interval_minimum = 80; // 100 ms
const uint16_t interval_maximum = 80; // 100 ms
const uint16_t timeout = 100;         // 10 s
const uint16_t latency = 5;           // skip 5 intervals      

void setup() 
{  
  USB.println(F("BLE_06 Example"));  

  // 0. Turn BLE module ON
  BLE.ON(SOCKET0);
}

void loop() 
{

  // 1. Look for a specific device
  USB.println(F("First scan for device"));  
  USB.print("Look for device: ");
  USB.println(MAC);
  if (BLE.scanDevice(MAC) == 1)
  {
    //2. now try to connect with the defined parameters.
    USB.println(F("Device found. Connecting... "));
    char buffer[50] = "interval=%d, timeout=%d, latency=%d\r\n";
    USB.printf(buffer, interval_minimum, timeout, latency);

    aux = BLE.connectDirect(MAC, interval_minimum, interval_maximum, timeout, latency);

    if (aux == 1) 
    {
      USB.print("Connected. connection_handle: ");
      USB.println(BLE.connection_handle, DEC);
      delay(1000);  

      // 3. get RSSI of the link
      USB.print("RSSI:");
      USB.println(BLE.getRSSI(BLE.connection_handle), DEC);
      delay(1000);

      // 4. disconnect
      BLE.disconnect(BLE.connection_handle);
      if (BLE.errorCode != 0) 
      {
        USB.println(F("disconnect fail"));
      }
      else
      {
        USB.println(F("Disconnected."));
      } 
    }
    else
    {
      USB.println(F("NOT Connected"));  
    }
  }
  else
  {
    USB.println(F("Device not found: "));
  }

  USB.println();
  delay(5000);
}

Output

E#
BLE_06 Example
First scan for device
Look for device:000780789EBF
Device found. Connecting...
interval=80, timeout=100, latency=5
Connected. connection_handle: 0;
RSSI:-75
Disconected.

First scan for device
Look for device:000780789EBF
Device found. Connecting...
interval=80, timeout=100, latency=5
Connected. connection_handle: 0;
RSSI:-77
Disconected.

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