When the phone locks, Socket.io experiences a disconnection

setInterval(function(){ 
socket.emit("stayalive", { "room": room });
}, 5000);

I have developed a simple browser application with an interval function that is currently running on my phone. I am using Chrome on my Nexus 4 for debugging purposes. However, I have encountered an issue where the interval stops after approximately 5 minutes when I lock the phone, leading to disconnection from the socket io server.

Interestingly, when I keep the screen unlocked, the interval continues running without any interruptions, and the phone remains connected to the server.

12:29:10 - First interval

12:34:27 - Last incoming interval

12:35:52 - Client disconnected from Server

I am curious if this behavior is related to an Android feature that kills intervals after 5 minutes when the phone is locked. My friends who are using different devices also seem to experience the same problem.

Despite using Chrome on my Nexus 4, it appears that users with various devices encounter similar issues.

Answer №1

Each operating system on mobile devices has its own battery protection measures in place to ensure the efficient usage of power. This includes managing how long certain functions can operate in the background, preventing excessive battery drain caused by apps.

Chrome variants also have restrictions on running intervals to conserve battery life, especially on mobile versions where activities like webSockets may require regular keep-alive packets for connection maintenance. It seems that Chrome prioritizes preserving battery when the phone is locked by limiting background processes. The reasoning behind this decision is likely based on the assumption that users are not actively engaging with applications while their phones are locked, making it a reasonable trade-off to extend battery life on smaller, mobile devices.

For web-based applications, there is limited control over how the browser manages background processes to save battery power. For better optimization of background notifications, native applications offer access to OS services like push notifications designed for long-running tasks in the background.


A potential solution could be detecting when the device or app is reactivated by the user and promptly reconnecting to retrieve any missed updates during the inactive period. Implementing this process automatically can enhance user experience without causing delays. To enable background notifications when the phone is locked, utilizing more native features through a push service may be necessary.

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