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Re: Peripheral not being discovered in the background until I open the BlueTooth Settings page
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Re: Peripheral not being discovered in the background until I open the BlueTooth Settings page

  • Subject: Re: Peripheral not being discovered in the background until I open the BlueTooth Settings page
  • From: Jan Lübeck (Fyrastudio) <email@hidden>
  • Date: Tue, 10 Nov 2015 15:52:43 -0500
  • X_v_e_cd: e0589476708c5a281863be1aa1383c87
  • X_v_r_cd: f16157868fd596a5c80c78bc456e2204
Hey Craig, I just found out that the service is definitely in the advertisement. This is what I'm getting in the centralManager:didDiscoverPeripheral delegate inside the advertisementData dictionary: 

{
    kCBAdvDataIsConnectable = 0;
    kCBAdvDataLocalName = OurBLEName;
    kCBAdvDataServiceUUIDs =     (
        "Human Interface Device",
        "BEC45326-A8D8-4A94-80FC-9AC1DE89DAA6"
    );
    kCBAdvDataTxPowerLevel = "-40";
}


That UUID is the one I'm scanning for. 

Any ideas?



______
Jan Lübeck
Chief Technology Officer
fyrastudio.com

On Mon, Nov 9, 2015 at 2:14 PM, Craig Dooley <email@hidden> wrote:
What is the device?  Is the service you are looking for in the advertisement, or in the scan response?  If the service is only in the scan response, it will not be found in background mode.

- Craig

On Nov 9, 2015, at 11:00 AM, Jan Lübeck (Fyrastudio) <email@hidden> wrote:

Hey all, first message here, so I hope I don't sound too newbie.

I've been looking at the documentation to have my app discover peripherals while on the background and I think I have it all set up correctly.

1) I wait until the CBCentralManager's state is CBCentralManagerStatePoweredOn before I start scanning.
2) On scanForPeripheralsWithServices I pass an array of UUIDs with the services. NOT scanning with nil as that doesn't work in the background. 
3) I have bluetooth-central inside UIBackgroundModes in my plist

With all these, eveything works great in the foreground, plus it works great if I discover the peripheral in the foreground and then go to the background. But if I go to the background before discovering the peripheral, it is never discovered.

UNLESS

I go to my phone Settings and open the BlueTooth page. Without even touching anything else, centralManager:didDiscoverPeripheral is called on my app as expected. 

This surprised me, but at least gave me something solid to come and ask here. 

Is there something I'm missing? 

I'm running iOS 9.1. Couldn't test on 8.x yet to see if it is a new thing.

Thanks!
______
Jan Lübeck
Chief Technology Officer
fyrastudio.com
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References: 
 >Peripheral not being discovered in the background until I open the BlueTooth Settings page (From: Jan Lübeck (Fyrastudio) <email@hidden>)
 >Re: Peripheral not being discovered in the background until I open the BlueTooth Settings page (From: Craig Dooley <email@hidden>)

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