iOS SDK device list not refreshing

Developer Tools
1

I have a custom iOS app that has its own login screen using the particle SDK as well as a table view that is populated with the user’s device list. I’m using the examples from the documentation:

    SparkCloud.sharedInstance().loginWithUser(particleUserName, password: particlePassword) { (error:NSError?) -> Void in
                if error != nil {
                    print("Wrong credentials or no internet connectivity, please try again")
                    let alert = UIAlertController(title: "Error", message: "Wrong credentials or no internet connectivity, please try again", preferredStyle: UIAlertControllerStyle.Alert)
                    alert.addAction(UIAlertAction(title: "Button", style: UIAlertActionStyle.Default, handler: nil))
                    self.presentViewController(alert, animated: true, completion: nil)
                }
                else {
                    print("Logged in")
                    self.performSegueWithIdentifier("tableView", sender: self)
                    
                }
            }

Where as the user name and password are from a text input field. Then once logged in, I can get the device list using the following code:

    var deviceList = [Devices]()

    func loadDevices() {
        SparkCloud.sharedInstance().getDevices { (sparkDevices:[AnyObject]?, error:NSError?) -> Void in
                if error != nil {
                    print("Check your internet connectivity")
                }
                else {
                    if let devices = sparkDevices as? [SparkDevice] {
                        for device in devices {
                            print(device)
                            var temp = Devices(deviceName: device.name!, deviceStat: device.connected)!
                            self.deviceList.append(temp)
                        }
                    }
                }
            }
        }

However, I’m running into an issue where if I refresh the table by calling loadDevices() again, the device doesn’t actually refresh, while it does. To explain, let’s say I have my photon disconnected when I run my app, login, and list the devices, the photon shows up as “disconnected”. While my app is running, I connect my photon, set it up, and successfully connect to the network. So I refresh my table but it shows up as “disconncected”. So I go to terminal and run particle list which shows that my photon is connected and online, and then I refresh my table again. Now the photon is shown as online.

Is this an authentication issue? Do I need to do inject a new access token before I can call the SparkCloud.sharedInstance().getDevices function again? Please let me know if you’ve run into similar problems. I’m also having trouble translating the

$ curl https://api.particle.io/oauth/token -u particle:particle -d grant_type=password -d username=joe@example.com -d password=SuperSecret

command given in the documentation to NSURL to fit my iOS needs.

2

Our mobile specialist is out of the office until Tuesday. I will tag him on the post though, so that when he gets back he can take a look at it for you.
@ido can you take a look at his for them?
Kyle

3

So I actually found the issue: it wasn’t because the device list was not refreshing, it was because it took a very long time for the api to register when the photon became offline (~20 seconds for me I don’t know if that’s normal) and coincidentally when I ran particle list was when the api saw that it was offline.

1 Like
4

That is normal, given the way how the cloud gets informed - or better gets to assume - of a device going offline.

The obvious problem is: "How do you tell your friends that all your ways of communication got cut off?"
You can’t, so they’d only learn of the fact when they try to contact you or you failed to contact them at a pre-appointed time.

The same here. The cloud expects to hear of the device every ten seconds, and when two of these pings have gone missing, the cloud assumes your device is offline - it still can’t know.

1 Like