Use the Tuya Cloud OpenAPI to send commands to a device and poll device property status

Steps

1. Create a Tuya Cloud project in the Tuya Developer Platform, subscribe to the Device Control API, and obtain your Access ID (client_id) and Access Secret (client_secret)
2. Implement the Tuya request signing algorithm: build the string-to-sign from the HTTP method, content hash, headers, and URL path, then HMAC-SHA256 sign it with the client secret; include the signature in the sign header
3. Obtain an access token: POST /v1.0/token?grant_type=1 with the signed headers; extract the access_token from the response
4. Query device status: GET /v1.0/devices/<device_id>/status with a signed request; the response returns an array of DP (data point) objects each with code, value, and type
5. Send a command to the device: POST /v1.0/devices/<device_id>/commands with a body containing a commands array of {code, value} objects matching the device's DP schema
6. Handle token expiry (access tokens have a limited lifetime): re-authenticate or implement automatic token refresh before the token expires