curl --request POST \
  --url http://0.0.0.0:3000/v1/webhooks/smartthings \
  --header 'Content-Type: application/json' \
  --data '
{
  "messageType": "EVENT",
  "events": [
    {
      "deviceEvent": {
        "deviceId": "device-uuid-123",
        "componentId": "main",
        "capability": "switch",
        "attribute": "switch",
        "value": "on"
      }
    }
  ]
}
'

import requests

url = "http://0.0.0.0:3000/v1/webhooks/smartthings"

payload = {
    "messageType": "EVENT",
    "events": [{ "deviceEvent": {
                "deviceId": "device-uuid-123",
                "componentId": "main",
                "capability": "switch",
                "attribute": "switch",
                "value": "on"
            } }]
}
headers = {"Content-Type": "application/json"}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({
    messageType: 'EVENT',
    events: [
      {
        deviceEvent: {
          deviceId: 'device-uuid-123',
          componentId: 'main',
          capability: 'switch',
          attribute: 'switch',
          value: 'on'
        }
      }
    ]
  })
};

fetch('http://0.0.0.0:3000/v1/webhooks/smartthings', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_PORT => "3000",
  CURLOPT_URL => "http://0.0.0.0:3000/v1/webhooks/smartthings",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'messageType' => 'EVENT',
    'events' => [
        [
                'deviceEvent' => [
                                'deviceId' => 'device-uuid-123',
                                'componentId' => 'main',
                                'capability' => 'switch',
                                'attribute' => 'switch',
                                'value' => 'on'
                ]
        ]
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "http://0.0.0.0:3000/v1/webhooks/smartthings"

	payload := strings.NewReader("{\n  \"messageType\": \"EVENT\",\n  \"events\": [\n    {\n      \"deviceEvent\": {\n        \"deviceId\": \"device-uuid-123\",\n        \"componentId\": \"main\",\n        \"capability\": \"switch\",\n        \"attribute\": \"switch\",\n        \"value\": \"on\"\n      }\n    }\n  ]\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("http://0.0.0.0:3000/v1/webhooks/smartthings")
  .header("Content-Type", "application/json")
  .body("{\n  \"messageType\": \"EVENT\",\n  \"events\": [\n    {\n      \"deviceEvent\": {\n        \"deviceId\": \"device-uuid-123\",\n        \"componentId\": \"main\",\n        \"capability\": \"switch\",\n        \"attribute\": \"switch\",\n        \"value\": \"on\"\n      }\n    }\n  ]\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("http://0.0.0.0:3000/v1/webhooks/smartthings")

http = Net::HTTP.new(url.host, url.port)

request = Net::HTTP::Post.new(url)
request["Content-Type"] = 'application/json'
request.body = "{\n  \"messageType\": \"EVENT\",\n  \"events\": [\n    {\n      \"deviceEvent\": {\n        \"deviceId\": \"device-uuid-123\",\n        \"componentId\": \"main\",\n        \"capability\": \"switch\",\n        \"attribute\": \"switch\",\n        \"value\": \"on\"\n      }\n    }\n  ]\n}"

response = http.request(request)
puts response.read_body

{
  "status": "ok"
}

{
  "error": "Internal error"
}