FCM tokens devices.

[hermes-ribeiro]

Greetings from Brazil!

Thank you for making this excellent library available.

Sorry if my doubt is a bit amateur, I'm not very fallowed with firebase. My question is about FCM and device tokens. Following the instructions from the Firebase ESP8266 client library, we inserted the device tokens permanently:

#define FIREBASE_FCM_SERVER_KEY "FIREBASE_PROJECT_CLOUD_MESSAGING_SERVER_KEY"
#define FIREBASE_FCM_DEVICE_TOKEN_1 "RECIPIENT_DEVICE_TOKEN"
#define FIREBASE_FCM_DEVICE_TOKEN_2 "ANOTHER_RECIPIENT_DEVICE_TOKEN"

And when these same tokens are renewed in the client app by Firebase? Would I have to recompile Esp8266 with the new Token?

Thank you one more time!

[mobizt]

It is for demo.

It used in these lines.

Firebase-ESP8266/examples/Messaging/Messaging.ino

Lines 71 to 75 in fa98e29

	fbdo.fcm.begin(FIREBASE_FCM_SERVER_KEY);
	fbdo.fcm.addDeviceToken(FIREBASE_FCM_DEVICE_TOKEN_1);
	fbdo.fcm.addDeviceToken(FIREBASE_FCM_DEVICE_TOKEN_2);

You can dynamically set from any string source at run time (change it later during use) e.g. read from remote server, local SD card or SPIFFS file, read from serial port, or human interfaces (Bluetooth app or web page) in the same way as you want to change WiFi SSID, password and some configuration data in your device at run time.

[mobizt]

At run time, you can call removeDeviceToken(index) or clearDeviceToken() later to remove some token or clear all token to add the new one from the string from the sources I mentioned above.

[hermes-ribeiro]

Thank you very much for the quick feedback.

I understood your explanation perfectly.

I can then create a method in the client app (android) to send the token in a database node, and in esp8266, another method to compare if I hear a change in this token. If there was a change, it discards the old token and receives the new token.
I will work on it.
Thank you very much for your attention!