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To establish a connection between Ionic BLE and a device's Mac Address on iOS:

1. Install the Ionic Native BLE plugin in your Ionic project by running the following command in your terminal:

   ionic cordova plugin add cordova-plugin-ble-central
   npm install @ionic-native/ble
   

2. Import the Ionic Native BLE plugin in your component, and create a function to connect to a device using the device's Mac Address:

   import { BLE } from '@ionic-native/ble/ngx';
   
   export class HomePage {
   
    constructor(private ble: BLE) { }
   
    connectToDevice(macAddress: string) {
      this.ble.connect(macAddress).subscribe(
        peripheral => console.log('Connected to', peripheral),
        error => console.log('Error connecting to', macAddress, error)
      );
    }
   
   }
   

3. Call the connectToDevice function with the Mac Address of the device you want to connect to:

   this.connectToDevice('00:11:22:33:44:55');
   

Note: Make sure that the device's Bluetooth is turned on and that the device is discoverable. Also, some devices require a pairing process before they can be connected, so make sure to check the device's documentation for any specific instructions.