i get delayed notifications or they don't come at all when my garage door opens or closes.

Diagnosis

The failure of the Nexx NXG-200 to deliver real-time notifications is rarely a failure of the hardware itself, but rather a breakdown in the "handshake" between the local device, the Nexx cloud server, and the mobile OS push notification service. When the magnetic reed switch on your garage door triggers, the NXG-200 sends a signal to your router, which then travels to the cloud server. If the device is experiencing "heartbeat" latency—where the connection to the server is intermittent—the notification may be queued or dropped entirely. Furthermore, modern mobile operating systems (iOS and Android) employ aggressive battery management. If the Nexx app is not explicitly whitelisted for background activity, the OS will put the app into a "suspended" state. In this state, the app cannot wake up to process the incoming push notification from the cloud, leading to delays where notifications only appear once you manually open the app, or not at all. You can confirm this by checking if the "Door Open" status updates instantly inside the app but the notification arrives minutes later; if so, the issue is your phone's OS, not the garage controller.

How to Fix It

To ensure near-instant notifications, you must remove the app from your phone's power-management restrictions and optimize the local signal strength. Follow these exact steps:

1. Android Battery Optimization: Navigate to Settings > Apps > Nexx > Battery. Change the setting from "Optimized" to "Unrestricted." This prevents the Android system from killing the background process that listens for the push token.
2. iOS Background Refresh: Go to Settings > General > Background App Refresh. Ensure the master toggle is ON, then scroll down to find the Nexx app and toggle it ON. Also, ensure "Low Power Mode" is disabled, as this throttles push notifications.
3. Notification Permissions: In your phone's main Settings menu, go to Notifications > Nexx. Ensure "Allow Notifications" is enabled and that "Critical Alerts" (if available) are toggled on to bypass "Do Not Disturb" modes.
4. Signal Stability Check: Open your router's admin panel (usually 192.168.1.1) and check the signal strength (RSSI) for the NXG-200. If the value is higher than -70dBm (e.g., -80dBm), the device is struggling to maintain a connection. Move your router closer or install a Wi-Fi extender within 10 feet of the garage door motor.
5. App Cache Clear: Force close the Nexx app, clear the app cache in your system settings, and restart your smartphone to refresh the push notification token associated with your account.

If That Didn't Work

If the steps above do not resolve the lag, the problem is likely rooted in the network environment or the hardware installation:

• Switch to a 2.4GHz Dedicated Band: The NXG-200 only supports 2.4GHz. If your router uses "Smart Connect" (merging 2.4GHz and 5GHz into one SSID), the device may be constantly hopping or dropping. Create a separate 2.4GHz guest network specifically for your smart home devices to ensure a stable, non-interrupted connection.
• Check Magnetic Sensor Alignment: If notifications are missed entirely (but the app shows the door is closed when it's actually open), the magnetic reed switch is likely too far from the sensor. The gap between the magnet and the NXG-200 sensor must be less than 10mm. Re-align the magnet on the door to ensure a tight seal when closed.
• DNS Optimization: Some ISP DNS servers cause delays in cloud communication. Log into your router and change your DNS settings to Google Public DNS (8.8.8.8 and 8.8.4.4). This often reduces the latency between the NXG-200 and the Nexx cloud servers.
• Firmware Forced Update: In the Nexx app, navigate to Device Settings > Firmware Update. If an update is available, perform it immediately. Outdated firmware often contains bugs in the MQTT protocol used to send status updates to the cloud.

Heads Up

• Avoid placing the NXG-200 directly against large metal beams or foil-backed insulation, as this creates a "Faraday cage" effect that kills Wi-Fi signal.
• If you use a VPN on your phone, disable it for the Nexx app; VPNs frequently interfere with the push notification tunnels used by smart home apps.
• Periodically check the wiring of the reed switch; loose connections at the terminal block can cause "ghost" notifications where the door appears to open and close rapidly.
• Ensure your router's DHCP lease time isn't too short; assigning a Static IP to the NXG-200 in your router settings prevents the device from disconnecting during IP renewal.