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Crashing on scan / connect loop (OSX)  #91

@matti777

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@matti777

Hi, am trying to extend the Explorer example to print out the Manufacturer name Characteristic of the Primary Service of each device. However the library is quickly crashing to the following (or similar):

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x70 pc=0x43887c6]

goroutine 17 [running, locked to thread]:
github.com/paypal/gatt.(*device).HandleXpcEvent(0xc420076200, 0xc420236c90, 0x0, 0x0)
	/Users/matti/go/src/github.com/paypal/gatt/device_darwin.go:456 +0xe66
github.com/paypal/gatt/xpc.handleXpcEvent(0x4a00020, 0x4b002f0)
	/Users/matti/go/src/github.com/paypal/gatt/xpc/xpc_darwin.go:200 +0x209
github.com/paypal/gatt/xpc._cgoexpwrap_9c8af0d8d6e4_handleXpcEvent(0x4a00020, 0x4b002f0)
	github.com/paypal/gatt/xpc/_obj/_cgo_gotypes.go:458 +0x35

My main difference is Im not calling StopScanning() but instead trying to connect to each device as soon it is discovered and then extracting the manufacturer name. I would prefer not to connect but I assume it is mandatory for accessing the Characteristics? I am not familiar with BLE that well.

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