Help setting up Serial Bridge on OH3

Setup, Configuration and Use Scripts & Rules
1

Would someone be able to offer some advice? I had this working fine on OH2.5. But I seem to be having problems setting it up with OH3.

It used to be set-up with an .items file

String Currentcost_raw "CurrentCost XML [%s]" { serial="/dev/ttyUSB1@57600" }

This would then populate the string and I would have a rule that would use xpath to get the values from the XML and populate various items.

With OH3 I have moved the serial connection to the .things file as follows:

Bridge serial:serialBridge:currentCost [serialPort="/dev/ttyUSB0", baudRate=57600] { Thing serialDevice displayUnit [patternMatch="REGEX:.*"] { Channels: Type string : rawData [patternMatch="REGEX:.*"] } }

And updated the .items file as follows

String CurrentCostRaw "CurrentCost XML [%s]" { serial="serial:serialDevice:currentCost:displayUnit:rawData" }

The log shows that it connects and I get a serial:serialBridge:currentCost:data triggered PRESSED but the CurrenCost_raw item remains NULL.

Would you know if this is setup correct? I’m struggling with the patterns. I have set .* hoping that will return everything, but it does not. Once I get the hang of this, I am hoping to populate the items via the things file, using regex instead of xpath in the rule. But I’m jumping ahead of myself, as I can’t receive anything at the moment.

Would anyone be able to see what I’m doing wrong? I have been looking at this for many hours!

Thanks.

2

Well, that was silly! Can you spot the mistake :man_facepalming:. It’s working now! Once I get this all working properly I’ll share it, as it may be of use for others.

1 Like
3

Hi, please share your things file as well as with site and items.
I’m struggling to send commands and get NULL as well.
Yes, I have “channels” and not serial as in your mistake :wink:

4

I try to control a projector using the serial binding in openhab 2.5.6.

If I use the “old” way of using the serial commands, it works correctly:
ITEMS:

String viewsonic1projector “Proj [%s]” (gProj) { serial=“/dev/ttyUSB1@9600,REGEX(.[A-Z]=(.?)#)” }

SITEMAP

Selection item=viewsonic1projector label=“Proj” mappings=[

                                            "\r*pow=on#\r"="ViewsonicON",

                                            "\r*pow=off#\r"="ViewsonicOFF",

                                            "\r*pow=?#\r"="ViewsonicPowerStatus",

                                            "\r*lampm=eco#\r"="ViewsonicECOmode",

                                            "\r*ltim=?#\r"="ViewsonicLampHours"]

But when I try to use a .THINGS file, all I get is NULL

To keep clear of errors, I tried using exact scheme of the serial binding documentation:

THINGS:

Bridge serial:serialBridge:sensors [serialPort=“/dev/ttyUSB1”, baudRate=9600] {

Thing serialDevice relay [patternMatch=".*"] {

    Channels:

        Type switch : serialRelay [patternMatch=".*", on="\r*pow=on#\r", off="\r*pow=off#\r"]

}

}

ITEMS:

Switch serialRelay “Relay Q1” (gProj) {channel=“serial:serialDevice:sensors:relay:serialRelay”}

Any input?

5

Just a note. But when pressing binding information in openhab, the page for binding 1 opens up.
Is there another binding in OH3 that is not available in OH2.5 that utilizes .things file?

6

Sure it’s here Serial Binding and Current Cost Energy Meter

However, I’m not sure how much it will help. I struggled with getting xpath to work in the things file via channels, so I did it all in rules.

This was for openhab 3, what version are you using? The binding settings changed a lot from 2.