KNX Datetime from openhab

Add-ons Bindings
1

Hi all,

does anybody send the current Datetime to the KNX Bus? I tried but failed :frowning:

2

Extesive discussion -

1 Like
3

Sure, easy:

UID: knx:device:bridge:generic
label: Generic Channels
thingTypeUID: knx:device
configuration:
  pingInterval: 600
  readInterval: 0
  fetch: false
bridgeUID: knx:ip:bridge
channels:
  - id: time
    channelTypeUID: knx:datetime-control
    label: Uhrzeit und Wochentag
    description: ""
    configuration:
      ga: 10.001:15/7/10

As openHAB is the “owner” of the status, use datetime-control. My devices have week timers (Wall switches) and they need a DPT 10.001. As these Channels are “property” of openHAB, the device must not have an address.

1 Like
4

Hi all. I am also trying to send, like once a day, the current time onto the KNX bus. Udo what you posted, if I understand correctly, shows the channel definition only. So one would then need to combine this with some kind of rule that actually sends the time over that channel periodically, right?

5

Yepp, that’s correct.

Complete as text configuration:
my.things:

Bridge knx:ip:bridge "knx/IP Interface" [ 
    ipAddress="192.168.178.45", 
    localIp="192.168.178.55", 
    type="TUNNEL"
 ] {
    Thing device Virtuell "virtuelle" @ "KNX" [ 
     ] {
        Type datetime-control : wochenzeit "Zeit und Tag" [ ga="10.001:15/7/10" ]
    }
}
Thing ntp:ntp:local "Lokale Zeit" [
    hostname="192.168.178.1",
    refreshInterval=120, 
    refreshNtp=30, 
    locale="de_DE", 
    timeZone="Europe/Berlin"
]

my.items:

DateTime LokaleZeitDateTime "Datum: [%1$tA, %1$td.%1$tm.%1$tY %1$tH:%1$tM]" <time> (gOhne) ["Status","Timestamp"] {channel="ntp:ntp:local:dateTime", channel="knx:device:bridge:Virtuell:wochenzeit"}
String   LokaleZeitString   "Datum und Zeit"                                <time> (gOhne) ["Status","Timestamp"] {channel="ntp:ntp:local:string"}

The ntp Addon will update the Item once every 120 Seconds. Every 30th Update it will issue a request to the ntp server (here the local router).
Every update of the Item will cause an update of the linked control-channel as well.

6

Works like a charm, thanks!

BTW for all people who - like me - need a separate date and time item as well, I defined my Thing as:

    Thing device env "Umgebung" [
//        readInterval=3600
    ] {
        Type datetime-control : DatumUhrzeit "Uhrzeit und Datum"        [ ga="19.001:0/0/2" ]
        Type datetime-control : Datum "Datum"                           [ ga="11.001:0/0/4" ]
        Type datetime-control : Uhrzeit "Uhrzeit"                       [ ga="10.001:0/0/6" ]
   }

and my Item simply as:

DateTime LokaleZeitDateTime "Datum und Uhrzeit [%1$tA, %1$td.%1$tm.%1$tY %1$tH:%1$tM]" <time> ["Status","Timestamp"] {channel="ntp:ntp:local:dateTime", channel="knx:device:bridge:env:DatumUhrzeit", channel="knx:device:bridge:env:Uhrzeit", channel="knx:device:bridge:env:Datum"}