Revision 17166: added: ability for client notifications: on connect, on disconnect, on ...

[System]

Revision 17166: added: ability for client notifications: on connect, on disconnect, on ...

added: ability for client notifications: on connect, on disconnect, on timeout
fixed: fhem failure on handling wirh mqtt-devices without or with wrong devio attribute

Source: Revision 17166: added: ability for client notifications: on connect, on disconnect, on ...