[OH3] ECMA Script for using sendHttpPostRequest

Setup, Configuration and Use Scripts & Rules
1

I try to convert a DSL rule to a ECMA script, but i’m getting stuck for the right strings:

DSL Rule:

val orangeassistPostURL = "http://92.168.1.2:2828/assist/ask"
val timeoutSec = 10
val orgeassistcmd = '{"request": "zet badkamer aan"}'

rule "Badkamer radio Aan"
when
    Item Schakel_Knop_Badkamer received command
then
    Thread::sleep(100)
    if(Schakel_Knop_Badkamer.state.toString == "single") {
        var result = sendHttpPostRequest(orangeassistPostURL, "text/plain", orgeassistcmd, timeoutSec*1000)
    }
end

ECMA Script so far:

var HttpUtil = Java.type("org.openhab.core.io.net.http.HttpUtil")
var url = "http://192.168.1.2:2828/assist/ask";
var orgeassistcmd = '{"request" : "zet badkamer aan"}';
HttpUtil.executeUrl("POST", url, orgeassistcmd, "text/plain", 2000)

But this gives me this error:

2021-01-21 09:35:56.863 [WARN ] [e.automation.internal.RuleEngineImpl] - Fail to execute action: 2
java.lang.ClassCastException: Cannot cast java.lang.String to java.io.InputStream

After changing orgeassistcmd to null, it’s working(POST send empty content), so I might need to change the format of orgeassistcmd?

2

As the error tells, your orgeassistcmd needs to be passed as a stream.

var stream = new java.io.ByteArrayInputStream(
    new java.lang.String(orgeassistcmd).getBytes("UTF-8") );

and then use stream instead of orgeassistcmd in the executeURL.

3

Instead of fighting with the low level stuff, why not use the openHAB sendHttpPostRequest Action like you did in the Rules DSL rule?

var HTTP = Java.type("org.openhab.core.model.script.actions.HTTP");
var url = "http://192.168.1.2:2828/assist/ask";
var orgeassistcmd = '{"request" : "zet badkamer aan"}';
var result = HTTP.sendHttpPostRequest(url, "text/plain", orgeassistcmd, 10*1000);
2 Likes
4

Good point! :+1:

5

Didn’t find this in any doc (yet?) was looking at this place: Actions | openHAB

Thanks for the reply!