Skip to main content

Today I Learned: One UI Closes WebSocket Connections on Task Switch from Chrome Browser

 During yesterday's POTA activations, I kept losing my control panel connection to Project TouCans. I restarted the rig's Pico-W several times to re-establish the connection before it occurred to me to think through the symptoms which were:

  • Productively using the control panel to key the rig
  • Switch to any other app on the phone besides the Chrome browser
  • Return to control panel on Chrome browser and the connection is gone.
On my implementation, the control panel's On button first opens a WebSocket to Project TouCans' Pico-W.



As an experiment, rather than power cycling the Pico-W, I simply hit the 'On' button again even though the rig was already on. Sure enough, that did it. The connection was back up and running.

I asked ChatGPT what might have caused this. I mentioned that the phone, as Samsung Galaxy 23 had forced an update of One UI. The answer that came back was that versions of One UI newer than 6, (I'm on 7 now), do indeed cut socket connections when the user moves away from a window to extend battery life:

Samsung’s One UI 6+ (which includes UIOne 6 for the Samsung Galaxy S23+) has introduced more aggressive background app management for battery optimization. When you switch away from an app—like your Chrome browser running a WebSocket connection—the OS may pause or even terminate certain background processes, including persistent network connections. In particular:

  • WebSocket connections are typically closed if the page is backgrounded for a period of time, especially if the OS is aggressively managing memory or battery usage.

  • In Chrome and other browsers, this effect can be more pronounced on Android because of how the OS suspends backgrounded tabs.

  • Even though Chrome tries to keep WebSockets open as long as possible, UIOne’s battery optimizations can forcibly pause or limit background network activity (like suspending the process holding the socket open).

Here's the full transcript. The end result of all this is that I'll have to push the 'On' button a bit more often until I ask ChatGPT to write me a code snippet that turns the socket back on automatically when I re-enter the control panel window.


Labels:

Comments

Post a Comment

Please leave your comments on this topic:

Popular posts from this blog

The Valentine's Day Magnetic Monopole

There's an assymetry to the form of the two Maxwell's equations shown in picture 1.  While the divergence of the electric field is proportional to the electric charge density at a given point, the divergence of the magnetic field is equal to zero.  This is typically explained in the following way.  While we know that electrons, the fundamental electric charge carriers exist, evidence seems to indicate that magnetic monopoles, the particles that would carry magnetic 'charge', either don't exist, or, the energies required to create them are so high that they are exceedingly rare.  That doesn't stop us from looking for them though! Keeping with the theme of Fairbank[1] and his academic progeny over the semester break, today's post is about the discovery of a magnetic monopole candidate event by one of the Fairbank's graduate students, Blas Cabrera[2].  Cabrera was utilizing a loop type of magnetic monopole detector.  Its operation is in...
1 comment
Read more

Cool Math Tricks: Deriving the Divergence, (Del or Nabla) into New (Cylindrical) Coordinate Systems

Now available as a Kindle ebook for 99 cents ! Get a spiffy ebook, and fund more physics The following is a pretty lengthy procedure, but converting the divergence, (nabla, del) operator between coordinate systems comes up pretty often. While there are tables for converting between common coordinate systems , there seem to be fewer explanations of the procedure for deriving the conversion, so here goes! What do we actually want? To convert the Cartesian nabla to the nabla for another coordinate system, say… cylindrical coordinates. What we’ll need: 1. The Cartesian Nabla: 2. A set of equations relating the Cartesian coordinates to cylindrical coordinates: 3. A set of equations relating the Cartesian basis vectors to the basis vectors of the new coordinate system: How to do it: Use the chain rule for differentiation to convert the derivatives with respect to the Cartesian variables to derivatives with respect to the cylindrical variables. The chain ...
10 comments
Read more

More Cowbell! Record Production using Google Forms and Charts

First, the what : This article shows how to embed a new Google Form into any web page. To demonstrate ths, a chart and form that allow blog readers to control the recording levels of each instrument in Blue Oyster Cult's "(Don't Fear) The Reaper" is used. HTML code from the Google version of the form included on this page is shown and the parts that need to be modified are highlighted. Next, the why : Google recently released an e-mail form feature that allows users of Google Documents to create an e-mail a form that automatically places each user's input into an associated spreadsheet. As it turns out, with a little bit of work, the forms that are created by Google Docs can be embedded into any web page. Now, The Goods: Click on the instrument you want turned up, click the submit button and then refresh the page. Through the magic of Google Forms as soon as you click on submit and refresh this web page, the data chart will update immediately. Turn up the:...
Post a Comment
Read more