Set value through pimatic api

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I want to change a variable value through the pimatic api with php. But i can’t find how to do it. What I’ve got now:

    $url = "http://admin:xxxx@192.168.1.202/api/variables/wiebe-distance";    
    $json = "{\"type\": \"value\", \"valueOrExpression\": \"$distance\"}";

these variables are sent to pimatic with curl. But I get: variable already exists.

@sweebee Did you use POST? If yes, use PATCH instead. The following works for me from the command line:

pi@raspi2 ~ $ curl --silent -X PATCH --header "Content-Type:application/json" --user "xxxx:xxxx" --data '{"type": "value", "valueOrExpression": 1337}'  http://localhost/api/variables/testme
{
  "variable": {
    "name": "testme",
    "readonly": false,
    "type": "value",
    "value": 1337,
    "unit": ""
  },
  "success": true

Using POST gives me the following:

pi@raspi2 ~ $  curl --silent -X POST  --header "Content-Type:application/json" --user "xxxx:xxxx" --data '{"type": "value", "valueOrExpression": 1337}'  http://localhost/api/variables/testme
{
  "success": false,
  "message": "There is already a variable with the name \"testme\""
}

Thanks, yes I used post. Patch works.