At work, I manage a cluster of several hundred nodes. All those nodesare equipped with a little LCD display, like to one showed in thepicture on the right. Until now, these displays were only displayingthe name of the cluster vendor at boot, and the node name when themachine was up an running. To put these neat little displays to betteruse, I wrote a Python program named lcd.py, which prints more usefulinformation.

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When started, lcd.py burns into the MVRAM of the display the nameof the company I am working for and the name of the node, which is infact the position of the node in the rack. This helps me find whichnode is which when I take several of them out of the rack formaintenance. I just power the machine for a few seconds to read itsname and position on the racks on the LCD display.

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Then, the daemon goes into an infinite loop to probe the disktemperature using the S.M.A.R.T information provided by the disk. Thisinformation is then displayed on the second line of the LCD display. Aquick look at the display and I know if something is wrong with thedisk or the machine. Of course this is not the only monitoring systemused to watch the system but every little detail helps. And it is funto use these little displays.

The program also pings the “master node” to see if there are anynetwork problems. If the “master node” cannot be reached, the programturns off the LCD display backlight. A quick glance at the entire rackand you know which node is in trouble.

For more information on these LCD display you can download themanual

Download the entire source code

My app 'MC-Timer' supports playing music with a mixture of Apple Music curated playlists, (Apple Music catalog playlists,) Apple Music songs, library playlists as well as individual songs from your media library.

Playback for songs from your media library and for those streamed from Apple Music works well with the iOS media player.

However, for items in your own 'catalog playlist', the Apple Music API will return playParams in the JSON response that may look like this:

By the way, parsing this into a dictionary of type [String: Any] is a huge pain and I wish the media player API could just accept the JSON as is. Apple, please add: MPMusicPlayerPlayParameters(json: String).

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To play this song, one can pass on the dictionary with the parameters to the music player as follows:

However, it only captures part of the dictionary:

And when you try to play that:

you will see:

and the music player will play any random song from your library instead.

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Neither does it work to play the song via its store identifier:

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Apparently, this is a known problem for years, and it has not been fixed.

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I hear that the purchaseId should be used instead, but this is undocumented. Also, if that is the case, the MPMusicPlayerPlayParameters should handle that under the hood.