Document operations API call

[tschamm]

When reading through the long polling results recently, I stumbled across a list of operations for some devices. For example the micromodule relais lists a sendImpulse operation:

    {
        "@type": "DeviceServiceData",
        "id": "ImpulseSwitch",
        "deviceId": "hdm:ZigBee:xxx",
        "state": {
            "@type": "ImpulseSwitchState",
            "impulseState": false,
            "impulseLength": 10,
            "instantOfLastImpulse": "..."
        },
        "operations": [
            "sendImpulse"
        ],
        "path": "/devices/hdm:ZigBee:xxx/services/ImpulseSwitch"
    },

I'm missing a documentation how to call these operations. What would be the correct API call?