CODEWITHSUNDEEP
cordovaionic-frameworkionic3
Roy Wu
Roy Wu

Reputation: 17

How to use cordova-plugin-ble-central's API Scan( ) from ionic1 to ionic3

I want to migrate a project from ionic1 to ionic3, but cordova-plugin-ble-central has some problems

ionic1

function quickScan( ) {
      var q = $ble.scan([], 3);
          q.then(function() {
        /* Done scanning */
        if (!sys.fsm.is("LISTING")) {
            setNumScans(0);
            return;
         }

        if (sys.numScans > 0)
        setNumScans(sys.numScans - 1);

        if (sys.numScans > 0) {
        quickScan();
        } else {
        if (sys.fsm.is("LISTING")) {
        sys.fsm.abort();
        sys.listOkCb(null);
        }
         }
    }, function(err) {
        /* Scanning Error */
        sys.fsm.abort();
        sys.listErrCb(err);
         }, function(dev) {
        /* New device found */
        addAndReportDevice(dev);
         });
    }

ionic3

       quickScan( ) {
       let q = this.Ble.scan([], 3)
        q.toPromise().then(function() {
        /* Done scanning */
        if (!this.fsm.is("LISTING")) {
        this.setNumScans(0);
          return;
     }
        if (this.numScans > 0)
        this.setNumScans(this.numScans - 1);

        if (this.numScans > 0) {
        this.quickScan();
     }else {
        console.log("BLE done scanning");
        if (this.fsm.is("LISTING")) {
        this.fsm.abort();
        this.listOkCb(null);
     }
      }
      },function(err) {
        /* Scanning Error */
        this.fsm.abort();
        this.listErrCb(err);
        /* New device found */
        this.addAndReportDevice(this.dev);
       });
     }

error message:TypeError: Cannot read property ‘scan’ of undefined.

I am not sure the usage of Scan() has changed.

Please tell me how to solve it.

Upvotes: 0

Views: 1150

Answers (1)

andypotato
andypotato

Reputation: 722

I assume you are using native BLE plugin for ionic 3. Here is a simple example how you can use it:

1) Import the BLE module in your app.module

import { BLE } from '@ionic-native/ble';

@NgModule({
    declarations: [AppComponent],
    providers: [
        BLE
    ]
}

2) In your page component inject the BLE module

constructor( private ble: BLE ) { ... }

3) Scan for nearby BLE devices like this:


const bleServices = ["service-uuid-you-want-to-scan-for"];

this.ble.startScan(bleServices).subscribe(
    device => { console.log('Discovered device:', JSON.stringify(device)); },
    error  => { console.log('Scan error:', error); }
);

Afterwards you can connect to your device using its device id this.ble.connect(device.id)

Upvotes: 1

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