The function is invoked as a task created by the main function after connecting to a Wi-Fi network. If an error occurs, a message indicating failure is logged. The result of the request is checked and, if successful, a message is logged indicating that the message was sent successfully. The esp_http_client library is used to send an HTTP POST request to the Twilio API with the constructed data. The Twilio API URL and the data to be sent are constructed from these variables and the auth information. The recipient and sender phone numbers, as well as the message to be sent, are defined as variables in the code. It requires a Twilio account, which provides an account SID and an auth token to be used for authentication. The ESP-IDF implements a function to send SMS messages using the Twilio API. ESP32 ESP-IDF Code to Send SMS with Twilio This is the same for every project which you will create through ESP-IDF Explorer. There are several folders inside our project folder. This opens the project that we created inside the EXPLORER tab. To open the project in a new window, click ‘Yes.’ You will get a notification that the project has been created. Go to the Twilio website (and sign up for a free account. Overall, Twilio provides a comprehensive and scalable platform for businesses and developers to build and integrate communication capabilities into their applications, products, and systems. Twilio also provides additional tools and services, such as Twilio Studio, a visual application builder, and Twilio Flex, a cloud-based contact center platform. ![]() With Twilio, developers can programmatically send and receive text messages, make and receive phone calls, send multimedia messages, and manage communication channels like WhatsApp and Facebook Messenger, all using simple REST APIs. Twilio’s web services allow developers to build and integrate communication capabilities into their applications and systems. Twilio is a cloud communications platform that provides APIs for voice and SMS communications, as well as other communication channels like video and chat. Before we move ahead, make sure you have the latest version of VS Code installed on your system with the ESP-IDF extension configured. We will program ESP32 with ESP-IDF in VS Code. But you can also send sensor readings such as DS18B20, DHT22, BME680, and SHT31, alter notifications, motion detection notifications, etc. For demonstration, we will send a simple text message. ![]() These fields will contain a message that we want to send. We will use HTTP client library available in ESP-IDF to make HTTP POST requests to Twilio REST API using different fields. Twilio is a cloud communications platform that allows software developers to programmatically make and receive phone calls, send and receive text messages, and perform other communication functions using its web service APIs.
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