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johnkeeping

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Note that this is only the Zigbee Light Link master key. A lot of devices use the Zigbee Home Automation specification which has a different well known master key (in that case it's in the standard which is freely available).

The ZLL key is slightly more interesting because you can factory reset (and effectively steal) devices in someone else's network, but that does require physical proximity to the device.

The master key also means that you can make your own device to add to someone's network. Most ZLL networks have a simple push button adding process, so you just need to be close to the button for a few seconds in order to add your own device to the network, after which you can control any other devices already in the network.

I always use "--no-ff" when merging topic branches to master. The advantage is that you can keep individual commits on the topic branch readable and still get an overview of the changes between two releases with "git log --first-parent".

You can also see the set of changes in a topic merge easily with "git log ${merge}^2..${merge}^1" whereas if you use a fast-forward merge it's not at all obvious which sets of commits are related.