0.6.6-beta - tighter filtering of received data

Actually, Mija object ID (data type field) must be two bytes long.

So far, the old algorithm checking only one byte of these two has been sufficient.
However, there was a precedent that revealed the insufficiency of this approach - #64.

I have aligned the code, but this change may lead to a refusal to receive data from some sensors that violate this rule.

Public beta test required!