NfcWriterEffect
fun NfcWriterEffect(url: String, onResult: (Boolean) -> Unit, onNfcDisabled: () -> Unit? = null)(source)
Writes url (a Meshtastic shared-contact or channel-set URL) to the next NDEF tag tapped against the phone. Mirrors NfcScannerEffect: keep it composed while a write is armed, dispose to disarm. onResult reports write success.