OTP-Pi is a server for sending SMS via HTTP, WebSocket and Message Broker protocols. Users can install OTP-Pi on the server with a static IP address that can be accessed by clients who will send SMS. In addition, users can also install OTP-Pi on servers with dynamic IP addresses. This server then accesses a websocket server, a Redis server, an MQTT server or a RabbitMQ server. OTP-Pi acts as a consumer that will send all SMS it receives.
