bluetooth lowenergy - iOS how to reconnect to BLE device in background? -

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there many related questions (apparently) no answers. so...

my ios app does updates ble device while app in background. if lose touch ble device, in centralmanager:diddisconnectperipheral: call -[cbcentralmanager cancelperipheralconnection:] -- otherwise never reconnect lost peripheral. call [(re)call -[cbcentralmanager scanforperipheralswithservices:options:].

logging shows me diddisconnectperipheral call, , contained calls, both happening while in background. however, reconnect happens when app wakes background.

so able communicate connected ble device while in background (yay!) not reconnect. quite important app, , (one think) other apps. suggestions welcome.

you don't need cancel connection - disconnected don't need rescan peripheral - have identified peripheral.

in diddisconnectperipheral can call

[central connectperipheral:peripheral options:nil];

core bluetooth reconnect once peripheral visible again

a complete sample here - https://github.com/paulw11/btbackground


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