Enabling Multiple Uses of NFC requestTechnology Instead of One-time

[divashuthron]

Hello. I am an IT developer working for a small company in Korea.

What I want to achieve is a functionality where, regardless of whether NFC is tapped once or not, pressing a 'Refresh' button turns off NFC reading and then turns it back on when pressed again.

However, I encountered an error after implementing this.

Could you please let me know if there is anything unusual in my source code?

[divashuthron]

const nfcTagLogin = async () => {
try {
NfcManager.start();
await NfcManager.requestTechnology(NfcTech.Ndef);
const tag = await NfcManager.getTag();
// console.log('NFC tagged, ID: ' + tag.id);

  webviewRef.current.postMessage(String(tag.id));
} catch (error) {
  console.error(error);
} finally {
  NfcManager.cancelTechnologyRequest().catch(() => 0);
}

};

const nfcClean = () => {
NfcManager.unregisterTagEvent();
NfcManager.cancelTechnologyRequest();
};

const nfcRefresh =() => {
nfcClean();
nfcTagLogin();
};

[georgipavlov-7DIGIT]

I think the problem comes from trying to start the scanning immediatly after the cancellation. I had a similar problem and solved it by adding a small delay, which in your case will look like this

const nfcRefresh = () => {
  NfcManager.cancelTechnologyRequest().then(async () => {
    await new Promise((resolve) => setTimeout(resolve, 3500)).then(() => {
      nfcTagLogin()
    });
  })
}

There might be a better solution, but this it the one that i managed to come up with, hope it helps you. Note that I haven't tested that on android

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