Fix notifications display

[fdur]

Fix notification display. Such notifications do not use the byte1. Add a check if this byte is used or not.

[fdur]

Using python client:

> add handler /app/cloudInterface/connected/value
Sending: H.01P/app/cloudInterface/connected/value
Received     : h@
Message type : response add handler
Status       : OK
Sequence     : 1

> Received     : cT1668087250.005864,P/app/cloudInterface/connected/value,Dfalse
Message type : handler call
Status       : NOT IMPLEMENTED
Sequence     : 1
Timestamp    : 1668087250.005864
Path         : /app/cloudInterface/connected/value
Data         : false

Acknowledged push notification

>
Received     : cT1668087264.986161,P/app/cloudInterface/connected/value,Dtrue
Message type : handler call
Status       : NOT IMPLEMENTED
Sequence     : 2
Timestamp    : 1668087264.986161
Path         : /app/cloudInterface/connected/value
Data         : true

Acknowledged push notification
>

[Nico26-sw]

Python client looks OK (except the "NOT IMPLEMENTED" print but this is minor) Thanks