Replace hardcoded hci0 reference, fix check for valid device. #1
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`hciconfig list` only returns one/first device on ubuntu and can't be used to reliably check presence of a device.
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This change allows running multiple announcements from one machine.
hciconfig listhad to be replaced as it only returns one/first device on ubuntu and can't be used to reliably check presence of devices other than hci0.