@sebastiankb Which TD/Thing did you try? Do you see the same errors when you interact with the following TD/Thing at coap://129.187.45.174:5683/Virtual-Coffee-Machine_2_16

{
  "@context":[
    "https://www.w3.org/2019/wot/td/v1",
    {
      "@language":"en"
    }
  ],
  "@type":"Thing",
  "id":"de:tum:ei:esi:fp:coffee:2-16",
  "title":"Virtual-Coffee-Machine_2_16",
  "description":"A virtual coffee machine to learn the WoT TD standard",
  "security":"nosec_sc",
  "securityDefinitions":{
    "nosec_sc":{
      "scheme":"nosec"
    }
  },
  "properties":{
    "state":{
      "type":"string",
      "readOnly":true,
      "enum":[
        "Ready",
        "Brewing",
        "Error"
      ],
      "forms":[
        {
          "href":"coap://esiremotelab.esi.ei.tum.de:5683/Virtual-Coffee-Machine_2_16/properties/state",
          "contentType":"application/json",
          "op":[
            "readproperty"
          ]
        }
      ],
      "writeOnly":false,
      "observable":false
    },
    "waterStatus":{
      "type":"integer",
      "readOnly":true,
      "unit":"%",
      "maximum":100,
      "minimum":0,
      "forms":[
        {
          "href":"coap://esiremotelab.esi.ei.tum.de:5683/Virtual-Coffee-Machine_2_16/properties/waterStatus",
          "contentType":"application/json",
          "op":[
            "readproperty"
          ]
        }
      ],
      "writeOnly":false,
      "observable":false
    },
    "coffeeStatus":{
      "type":"integer",
      "readOnly":true,
      "unit":"%",
      "maximum":100,
      "minimum":0,
      "forms":[
        {
          "href":"coap://esiremotelab.esi.ei.tum.de:5683/Virtual-Coffee-Machine_2_16/properties/coffeeStatus",
          "contentType":"application/json",
          "op":[
            "readproperty"
          ]
        }
      ],
      "writeOnly":false,
      "observable":false
    },
    "binStatus":{
      "type":"integer",
      "readOnly":true,
      "unit":"%",
      "maximum":100,
      "minimum":0,
      "forms":[
        {
          "href":"coap://esiremotelab.esi.ei.tum.de:5683/Virtual-Coffee-Machine_2_16/properties/binStatus",
          "contentType":"application/json",
          "op":[
            "readproperty"
          ]
        }
      ],
      "writeOnly":false,
      "observable":false
    }
  },
  "actions":{
    "brew":{
      "input":{
        "type":"string",
        "enum":[
          "latte-machiato",
          "espresso",
          "cappuccino"
        ]
      },
      "forms":[
        {
          "href":"coap://esiremotelab.esi.ei.tum.de:5683/Virtual-Coffee-Machine_2_16/actions/brew",
          "contentType":"application/json",
          "op":"invokeaction"
        }
      ],
      "idempotent":false,
      "safe":false
    },
    "abort":{
      "forms":[
        {
          "href":"coap://esiremotelab.esi.ei.tum.de:5683/Virtual-Coffee-Machine_2_16/actions/abort",
          "contentType":"application/json",
          "op":"invokeaction"
        }
      ],
      "idempotent":false,
      "safe":false
    },
    "shutdown":{
      "forms":[
        {
          "href":"coap://esiremotelab.esi.ei.tum.de:5683/Virtual-Coffee-Machine_2_16/actions/shutdown",
          "contentType":"application/json",
          "op":"invokeaction"
        }
      ],
      "idempotent":false,
      "safe":false
    }
  },
  "events":{
    "maintenance":{
      "data":{
        "type":"string"
      },
      "forms":[
        {
          "href":"coap://esiremotelab.esi.ei.tum.de:5683/Virtual-Coffee-Machine_2_16/events/maintenance",
          "contentType":"application/json",
          "op":"subscribeevent"
        }
      ]
    },
    "error":{
      "data":{
        "type":"string"
      },
      "forms":[
        {
          "href":"coap://esiremotelab.esi.ei.tum.de:5683/Virtual-Coffee-Machine_2_16/events/error",
          "contentType":"application/json",
          "op":"subscribeevent"
        }
      ]
    }
  }
}

Bug: No CoAP Communication Possible #69

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