Suppose I have to move out 3 hours away from my girlfriend's apartment, and I am running a Colab Environment. I can't stop the process and I need to bring my computer with me. How can I prevent the running process from being disconnected?
I have tried that question, but I think the Google Colab Interface has changed a bit, so the answers are no longer up-to-date.
There are many answers there. Currently for me works perfectly to go to the console and type
function ClickConnect(){
console.log("Clicked on connect button");
document.querySelector("colab-connect-button").click()
}
setInterval(ClickConnect,60000)
Take note that this should prevent disconnecting after each 1.5 hours of inactivity, but each runtime, if you don't have Colab Pro, will be terminated after 12 hours.
Edit:
I have tested my self and come up that this works:
function ClickConnect(){
console.log("Clicked on connect button");
document.querySelector("#ok").click()
}
setInterval(ClickConnect,60000)
Note that it will throw an error, its ok, it means that the Disconnection notification is not shown. Once it appear it will be clicked to reconnect.
There is this article from towards science that might help you prevent colab from disconecting
As a second thought, I think that as long as your laptop stays connected and active to a network it will keep running, so, an alternative is to use your phone as a hotspot to connect; use ethernet && wifi all together in order when you remove the cable you'll still be connected. But you have to keep your laptop open so you need battery fully charged; otherwise use a different device to start colab from like phone or tablet.
Related
I was able to make a working HID USB stack on my "StartUSB for PIC" board for the 18F2550 microcontroller. I based it on one of the MLA libraries, which was made for the 18F45K50 (MLA 2018_11_26, hid_custom, picdem_fs_usb_k50.x), but I converted it to work with the 18F2550 (there might have been easier ways, but only learned to work with PIC about 1 month ago). On the host side, I'm using LibUsbDotNet (also here, there might be easier ways - the documentation on this library really sucks) on a Windows 10 machine.
I'm using the HID class, full speed, and all seems to work. Although, I get some random errors on the host PC (see below), but doing one close/re-open cycle on the host side when getting the error is kind of solving it. Dirty, but it works. So I kind of ignore this now.
Win32Error:Win32Error:GetOverlappedResult Ep 0x01
995:The I/O operation has been aborted because of either a thread exit or an application request.
I'm not an expert on USB (yet). But all examples I'm seeing are based on 1) you send first a command to the device and 2) then you retrieve the answer from the device. I did some performance tests, and see that this indeed shows that I can do about 500 cycles/second. I think that is correct, because each cycle, sending command and retrieving answer, each takes 1 msec.
But do I really need to send a command? Can't I just keep reading endlessly, and when the device has somthing to say, it does send the data in an IN transaction, and when not it ignores which creates a timeout on the host side. That would mean that I can poll at 1000 cycles/second? Unfortunately, I have tried it by changing my implementation on the PIC, but I get very weird results. I think I have issues with suspend mode. That brings me to another question - how can I make the device get out of suspend mode (means that not the host, but the device should be triggering this event). I have searched the MLA library for command such as "wakeup", "resume", ... but couldn't find anything.
So, to summarize, 2 questions:
Conceptual: Can I send data from device to host without being requested for it by a command from the host?
For PIC experts: How can I have a device trigger for a wakeup from suspend mode?
And indeed, the answer is Yes on the first question.
In the meantime, I found another link on the web that contains a Visual Studio C# implementation of a USB library including all the source files.
If you're interested, this is the link
This C# host implementation works as a charm. Without sending a command to the device, I get notified immediately if a button is pressed. Great!
It also proofs that my earlier device implementation based on the original MicroChip MLA, is 100% correct. I stress tested the implementation by sending a "toggle LED command" as fast as I could, and I reach 1000 commands/second. Again great!
I think that LibUsbDotNet isn't that perfect after all. As I wrote above, I get rather unstable communication (Win32Error). But with this implementation, I don't get a single error, even after running for half an hour # 1000 commands/second.
So for me, case closed.
I'm using code from Google's sample game "ButtonClicker2000" found here: https://github.com/playgameservices/android-basic-samples
I have 3 androids running this game in genymotion plus one on my own phone, debugging them all from android studio. I've gotten to a point where I'm trying to gracefully handle disconnect in the event of network issues. The way I'm simulating network issues is toggling the wifi on my phone. (on or off, same behavior) After that, real time messages from my phone are no longer being received by the virtual devices, and my phone is no longer receiving real time messages from the other devices. However, my phone never enters onDisconnect() and the other devices never enter onPeersDisconnected. If I exit the app on my phone after communication ceases, onPeerLeft fires on the other devices.
How can I either ensure communication between devices in a game isn't lost in the likely event that a user at some point comes in or out of range of their wifi? If that's not possible, how can I at least ensure the onDisconnect event is firing from the offending device and onPeersDisconnected event is firing on the others?
If we're going with what the documentation states, onDisconnect usually happens when there's a problem with the remote services (crash or resource problem). having the WiFi turned off doesn't look like it fits with those criteria. [onPeersDisconnected](https://developers.google.com/android/reference/com/google/android/gms/games/multiplayer/realtime/RoomStatusUpdateListener#onPeersDisconnected(com.google.android.gms.games.multiplayer.realtime.Room, java.util.List)) is called when the participants are disconnected from the room.
Determine if the onP2PConnected is called when its connected and onP2PDisconnected when disconnected (hopefully this can catch WiFi toggling cases) since I think its more appropriate when you're using real-time multiplayer.
You can also read more about it in the Real-time Multiplayer section of the documentaiton.
Hope this helps!
I used successfully my raspberry camera times ago.
Now I tried again to acquire a image with the raspistill -o image.jpg command; the red led on the camera flashes, but I get this error:
mmal: No data received from sensor.
Check all connections, including the Sunny one on the camera board
Of course the camera connections are fine. Is there any other way to check if the camera is still working?
This error usually appears because of a faulty connection with the camera.
I had the exact same problem in different camera+Pi configurations. The following case is what I encountered:
The connector is not correctly inserted either in the camera or in the Pi.
The Sunny connector (the small yellow one on the camera) is not connected well.
(now it gets interesting)
If you often remove and reinsert the camera in the Pi please be sure to remove all power from the Pi. The sensor is very sensitive and a spark on the wrong pin could burn it. (I did this already unfortunately)
This could also trigger a problem with the Pi connector pins. It was somewhat confirmed that for Pi2 the connector may have some bad soldering which could lead to cold contact soldering. You can fix this by using some flux on the pins and then pass the soldering iron hot end over the pins to remake the connection.
I used a longer cable that had both connectors on the same side of the cable. If you connect it like it is you can burn your sensor and the Pi will not start because of the power surge (also the camera gets very hot in this case). DO NOT REMOVE IT from the Pi without removing power before. To a cable like this you have to remove the blue plastic from one end and bend the connector with the contacts on the other side. Insert this end in the camera since this will not be removed/inserted as often as the Pi end.
Make sure that the silver contacts are well inserted into the PCB connector.
(video here)
Also, make sure that the sunny connector is firmly attached.
This fixed it for me.
I was experiencing the same problem too, until I found a solution.
I removed the sunny connector(the yellow thingy below the camera in the board) and fixed it in the same place. The camera is working fine after trying this.
I have got the same issue. I have find out it was a power supply issue.
Try to change your cable and/or your raspberry power supply adaptor.
You check if this is your reason of your problem by typing:
$ dmesg
if you see something like this:
[ 44.152029] Under-voltage detected! (0x00050005)
-> Then replace your power supply! :D
The only fix for me was to purchase a new camera.
No real root causes identified.
My problem was I put the camera in, while the Pi was on. which might
have made the camera shot. i.e the camera module is static sensitive
and it's possible that it's been damaged
Unfortunately if this is the case there's nothing you can realistically do to fix it, just get a replacement.
This specific error shows when another application is using the camera. In my case, it was motion.
It might be possible that the cable is placed the wrong way. I had this problem and after multiple tries I realized that was the problem.
I developed a game for android with the google play services realtime multiplayer feature. I currently have a problem when matching the players. I dont use any invite feature, so all players just use the automatch functionality.
My game can be played with 4 players, but games with just 3 or 2 players are also possible. For my testing with 2 devices i use:
RoomConfig.createAutoMatchCriteria(minNumberOfOpponents, maxNumberOfOpponents, 0);
If i keep starting, ending and restarting games for a number of times, it often happens that the clients are not connected correctly. In the working cases the games onRoomConnected is called correctly and the game starts. In some cases tho, this is not happening. In theses cases, one device finds the other device and its onPeerJoined() and onRoomConnecting() callback is called. onRoomConnected() is never called tho. Thats because the other device gets no information whatsoever, just the roomCreated callback is called, and thats it.
So one device finds the other, and gets the information that another device joined the room. It also gets informed when this device leaves the room again. But the other device doesnt recognize any of this.
If this helps. i had some issues with losing connection before, and fixed it by restarting the apiClient everytime a room left on any clint. I dont think this is related tho.
I thought that might be a problem with leaving the current room correctly, and somehow joining the old room again, but it also happens ehen starting the app for the first time. Also the apiClient reconnect should avoid this problem
Thx in advance
Edit: It seems like its just my nexus 5 which produces the error. Every other device i tested works fine. The Nexus 5 does too in most cases. If the clients get connected and the game starts, there has never been any problem. The errrr just happens on this one device, and only in maybe 5 out of 6 cases, when searching an online game.
It just stops getting any callbacks called, sometimes right after the onRoomCreated(), sometime after he found another peer and onRoomConnecting(), and sometimes after onRoomConnected() has been called.
The other device gets its appropiate callbacks called tho in these cases.
So if the error device stops at onRoomCreated() the other device finds the client.
If the error device finds the other device and gets onRoomConnecting() called and stops after, the other device gets its onRoomConnected().
And if the error device gets its onRoomConnected() called, it sometimes even stops getting any messages from there on, while the other device is already in the game.
Maybe this helps someone. i'm not 100 % sure i fixed my problem. Haven't tested it in depth, but it seems everything is working fine now.
My problem was, that i have 2 different threads in my application, where the standard activity GUI thread starts the apiClient and handles the callbacks, while the gameengine thread initiates the room creation and sends the reliable messages via the apiClient.
It seems, sometimes things mess up while the peers connect and trade their first data. Currently i avoided directly calling any apiClient actions from the gameengine thread, but use runOnGuiThread to handle these actions on the Activity Gui Thread.
I built a navigator and have a problem with the GPS, sometimes it takes forever to get a GPS-fix even though the device is outside with nothing blocking it. If I start TomTom the GPS gets a fix almost instantly on the same device. I can also get a fix faster if I restart the device.
Its like the GPS is in a sleep mode and has to be "poked" for it to start sending coordinates. Anyone knows anything about this and how to get it working faster in win CF c#?