Ionic4: Phonegap-nfc: where is the content? - ionic4

Question

VERSION: Ionic 4
Plugin: phonegap-nfc
Hi everyone!
I'm trying to use this plugin (https://ionicframework.com/docs/native/nfc) and following the instructions, I should be able to read a message sent from another NFC device. The event is fired and I know something is sent, but I'm not able to understand what and where the message is stored.
This is the code:
home.page.ts
import { Component } from '#angular/core';
import {Ndef, NFC} from '#ionic-native/nfc/ngx';
import {AlertController} from '#ionic/angular';
#Component({
selector: 'app-home',
templateUrl: 'home.page.html',
styleUrls: ['home.page.scss'],
})
export class HomePage {
constructor(private nfc: NFC, private ndef: Ndef, private alertController: AlertController) { }
readNFC() {
this.nfc.addNdefListener(() => {
this.presentAlert('ok');
}, (err) => {
this.presentAlert('ko' + err);
}).subscribe((event) => {
console.log(event);
console.log(JSON.stringify(event));
this.presentAlert('Il messaggio contiene' + event.tag + ' ' + this.nfc.bytesToHexString(event.tag.id));
});
}
writeNFC() {
this.nfc.addNdefListener(() => {
console.log('successfully attached ndef listener');
const message = this.ndef.textRecord('Hello world');
this.nfc.share([message]).then(
value => {
this.presentAlert('ok');
}
).catch(
reason => {
this.presentAlert('ko');
}
);
}, (err) => {
this.presentAlert('ko' + err);
});
}
async presentAlert(mess) {
const alert = await this.alertController.create({
header: 'attenzione',
message: mess,
buttons: ['OK']
});
await alert.present();
}
}
app.module.ts
import { NgModule } from '#angular/core';
import { BrowserModule } from '#angular/platform-browser';
import { RouteReuseStrategy } from '#angular/router';
import { IonicModule, IonicRouteStrategy } from '#ionic/angular';
import { SplashScreen } from '#ionic-native/splash-screen/ngx';
import { StatusBar } from '#ionic-native/status-bar/ngx';
import { AppComponent } from './app.component';
import { AppRoutingModule } from './app-routing.module';
import {Ndef, NFC} from '#ionic-native/nfc/ngx';
#NgModule({
declarations: [AppComponent],
entryComponents: [],
imports: [BrowserModule, IonicModule.forRoot(), AppRoutingModule],
providers: [
StatusBar,
SplashScreen,
{ provide: RouteReuseStrategy, useClass: IonicRouteStrategy },
NFC,
Ndef
],
bootstrap: [AppComponent]
})
export class AppModule {}
This is the stringify obtained by printing the content of event:
{"isTrusted":false,"tag":{"id":[0],"techTypes":["android.nfc.tech.Ndef"],"type":"android.ndef.unknown","maxSize":0,"isWritable":false,"ndefMessage":[{"tnf":1,"type":[85],"id":[],"payload":[3,112,108,97,121,46,103,111,111,103,108,101,46,99,111,109,47,115,116,111,114,101,47,97,112,112,115,47,100,101,116,97,105,108,115,63,105,100,61,99,111,109,46,119,97,107,100,101,118,46,119,100,110,102,99,38,102,101,97,116,117,114,101,61,98,101,97,109]},{"tnf":4,"type":[97,110,100,114,111,105,100,46,99,111,109,58,112,107,103],"id":[],"payload":[99,111,109,46,119,97,107,100,101,118,46,119,100,110,102,99]}],"canMakeReadOnly":false}}
Thanks in advance for your help!

Answer 1

Your data is at
ndefMessage[0].payload
you need to use
nfc.bytesToString()
the payload to convert to string