Bug in protocol spec

Hi, thanks for this doc. Helped me a lot to implement support for those devices in nymea (https://wiki.nymea.io).

Just wanted to point out that there is an error in the protocol description in point 2.3:

X=0 tasti sbloccati

X=2 tasti bloccati

Apart from the mistake in the chosen language (saluti all' italia ;) it also lacks some information. Should be:

X=0 keypad unlocked

X=1 locked due to open window detection

X=2 locked due to manual lock enabled

X=3 locked due to open window detection AND manual lock enabled

so, in fact it's a 1 byte sized bit mask where bit 0 indicates the open window detection state and bit 1 indicates the keypad lock state.