Groot comments

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                                            Groot

你看下你是不是往 `/a1t33GfOMp5/${deviceName}/data` 发的数据啊，这个 topic 要自己在控制台建立的

I run into the same error, the reason is I delete the backup_label in data directory. @_@

nope

My point is better to raise exceptions instead of return a default value silently if can't read settings from the database.