Webhooks

Webhooks connect the Larnitech system with any internet service that can send or receive HTTP requests (for example IFTTT). They are set up in LT Setup on the Webhooks tab, which has two parts:

• Events: the Larnitech server sends an HTTP request to an external URL when something happens in the system.
• Actions: an external service sends an HTTP request to the Larnitech server, and the server changes the state of an item.

Events

An event has the following fields:

Field	Description
Name	Name of the event. It is used in the script that sends the event.
URL	Address that the server calls.
Method	GET (default) or POST.
Feedback	Optional. Item address and a regular expression: the value found in the answer is written to that item.

The event is sent from a script. In LT Setup open Scripts → Scripts from logic → Add Blockly script, add the device event on the Triggers tab, put the Make webhook block from the Automation tab into it and choose the event name.

Actions

An action has a name, an item and the state to set (on, off, reverse, level, mode, target temperature and so on, depending on the item type).

To run an action, call the URL:

• in the local network: http://CONTROLLER_IP/webhook/?key=API_KEY&name=ACTION_NAME
• over the internet: https://service.larnitech.com/webhook/?key=API_KEY&sn=SERIAL&name=ACTION_NAME

where:

• API_KEY: API key of the server (the TCP-API key, see API2);
• SERIAL: serial number of the server;
• ACTION_NAME: name of the action from the Name field.

The server answers with JSON. An error answer has "result":"ERROR" and a message, for example Error Key (wrong key) or Action not found.

Example

The settings are stored in /home/settings/webhooks.json. Example with one event with feedback and two actions:

 1{
 2  "events": [
 3    {
 4      "name": "997:1_button_pressed",
 5      "url": "https://maker.ifttt.com/trigger/997:1_button_pressed/with/key/YOUR_IFTTT_KEY",
 6      "method": "POST"
 7    },
 8    {
 9      "name": "447:145_sensor_state",
10      "url": "https://example.com/weather.json",
11      "feedback": { "addr": "447:145", "regexp": "/\"temp\":\"(-?[0-9]+)\",/" }
12    }
13  ],
14  "actions": [
15    {
16      "name": "401:1_lamp_on",
17      "status": [ { "request": "status-set", "addr": "401:1", "status": { "state": "on" } } ]
18    },
19    {
20      "name": "401:1_lamp_reverse",
21      "status": [ { "request": "status-set", "addr": "401:1", "status": { "state": "reverse" } } ]
22    }
23  ]
24}

See also: IFTTT (IF This, Then That), API2.