I need to read from serial port 3 bytes and process them afterwards. It’s for a light switch with up to 6 buttons. Format is as following: first byte: - current status - button pressed/released second byte: number of wall switch third byte: 00 - no button pressed 01-06 - number of button …

Thanks all for the help/hints. Finally we where able to solve it as following: System is still running with Locale UTF-8. No need to change it nor to change any EXTRA_JAVA_OPTS definitions. Just add “CHARSET(ISO-8859-1)” to items definition. items file: String serialsT1 "key1 [%s]" { serial="/d…

You would use the Serial binding. I think you will need to use both the REGEX and Base64. [image] Serial - Bindings The Serial binding allows openHAB to communicate over serial ports attached to the openHAB server. The REGEX will need to match the three byte…

Thanks for answering. I already played around with this binding but without success. I just don’t see the hex values to be able to do the REGEX. If i use this items file (without BASE64): String serialsT1 "Key1 [%s]" { serial="/dev/ttyAMA0@9600"} This is the result: 18:02:31.438 [INFO ] [smartho…

Probably the easiest thing will be to just set a String Item to the full message (Base64) and use String manipulation inside a Rule to extract the values you need.

I think if you look at serialsT1.state.toString it will look more like the bytes you expect.

Thanks for the inputs. Tried now with rule and BASE64 but still no correct data. I’m frustrated… My current items file: String serialsT1 "Key1 [%s]" { serial="/dev/ttyAMA0@9600,BASE64"} My current rule: import javax.xml.bind.DatatypeConverter rule "check values" when Item serialsT1 change…

[image] rossko57: I think if you look at serialsT1.state.toString it will look more like the bytes you expect. At least let us see what you are feeding this DatatypeConverter

Added a line in rules to show value of serialsT1.state.toString: enabled also DEBUG mode on serial binding, but didn’t gave any valueable data.. :disappointed_relieved: import javax.xml.bind.DatatypeConverter rule "check values" when Item serialsT1 changed then logInfo("plain value", "s…

The values you are getting from the binding are Base64. When you decode the Base64 you end up back to raw bytes. To use the REGEX you need to do so on the Base64 encoded value. Otherwise you need to do binary manipulation with is not easy to do in Rules DSL. You will not be able to look for “ff 0…

Writing for @Fridolin22 (working on this together with him). We got it to work to print the serial value. It seems kind of okay, but is different from what we actually should get. We get lines like: EF BF BD 01 00 EF BF BD 02 00 So somehow it seems like we get EF BF BD instead of FF. But the qu…

EF BF BD is the UTF-8 “replacement” character, shows up as � in the log strings. Somewhere you’ve got UTF-8 encoding, probably by a default setting. Think you have to get into EXTRA_JAVA_OPTS to change this. Or if you’re scripting, who cares so long as its consistent?

[SOLVED] Read 3 bytes from Serial Port

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rossko57 (Rossko57) February 27, 2019, 1:11pm 13

No idea. What is “correct”?
This might help