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Seems the serializer doesn't specify content type when there's no content.

Why using POST with empty parameters at all?
GET should do the same without this error.

Are you not specifying content type for post request?

Are you sure you want to set value for sensorMultilevel and not switchMultilevel? How do you expect to set value on a sensor?
If you've meant switchMultilevel, it also supports "/command/on" and "/command/off", and also "/command/exact?level=75" to set specific value.

/var/log/z-way-server.log

А в логе zway что?

И я, кажется, ошибся насчет того, что ему подходят значения 0 и 1, посмотрел не в ту ветку.
Тогда придется немного извратиться:

zway_cc_switch_multilevel_get() only queues "get value" request to device. First of all, it is not necessarily sent out immediately, because device may be sleeping (so it will postpone sending until device is awake). Second, device might answer that request with delay, or not reply at all....

ZAutomation usually doesn't have Basic CC as a device if there's more specific command class (like Multilevel Switch) present, so there's no exact analog for your command. But here's something similar:

Try to add this: manager.responseSerializer.acceptableContentTypes = [NSSet setWithObject:@"text/plain"]; Valid response should always be json, so there's no need to do that. And if you look at error.data provided, it says "Uncaught TypeError: Cannot read property 'toLowerCase' of un...

No offence, but icons look awful to me: 1) overall gradient (and its shape in particular) is awkward; 2) icons themselves are skeuomorphic while all other design is mostly flat; 3) pixelated corners suggest upscaling at least 4 times, which makes icons blurred badly. Also there's something wrong wit...

Абракадабра внутри /…/ – это регулярное выражение в js. Про их синтаксис нужно читать много и отдельно, так что я оставлю это на самостоятельное изучение, расскажу лишь про конкретный частный случай. Скобками обозначается группа. Запись ?: в начале группы означает, что группа не попадет отдельно в к...