Troubleshooting Frequent Disconnections with Firebase Cloud Messaging (FCM) on Mobile Networks

Experiencing frequent disconnections with Firebase Cloud Messaging (FCM) every 60 seconds on mobile networks can be frustrating. Unlike using a Wi-Fi connection (e.g., through a router with bypassing capabilities), mobile networks present unique challenges that can lead to these interruptions.

Here's a breakdown of possible reasons behind this issue and how to troubleshoot them:

* **Network Instability:** Mobile networks are inherently less stable than Wi-Fi connections. Signal fluctuations, network congestion, or temporary outages can cause FCM to lose connectivity.

* **Data Optimization Settings:** Some mobile carriers or devices implement data optimization settings that might throttle background data usage, including FCM notifications.

* **App-Specific Configurations:**
- **Battery Saver Mode:**
- If your device is in battery saver mode, FCM might be temporarily suspended to conserve power.
- **App Permissions:**
- Ensure your app has the necessary permissions to receive notifications in the background.
* **APN Settings:**
- Incorrect or outdated Access Point Name (APN) settings can interfere with network communication, including FCM.

**Troubleshooting Tips:**

1. **Check Network Connection:** Confirm you have a strong and stable mobile data connection.
2. **Disable Battery Saver Mode:** Temporarily disable battery saver mode to see if that resolves the issue.
3. **Check App Permissions:** Go to your device's settings and ensure your app has the necessary permissions to receive notifications.
4. **Review APN Settings:** Double-check your APN settings with your mobile carrier for accuracy.
5. **Restart Your Device:** Sometimes, a simple restart can help refresh network connections.
6. **Update FCM SDK:** Ensure you're using the latest version of the Firebase Cloud Messaging SDK to benefit from bug fixes and improvements.

**Note:**

The use of proxies, especially those designed to bypass network restrictions, can introduce complexities and might not be recommended for reliable FCM functionality.

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