![]() After that, we include the server url with http.begin and the content type with http.addHeader. When the ESP32 board can connect to the network, an instance of HTTPClient is created. At this point in time, code execution will block until your ESP32 board is able to connect to the wireless network. When the postDataToServer function is called, the board will print an indication to serial.Īfter doing so, the code calls n() to check if the board is connected to the WiFi network. Once the wireless credentials is specified, it then calls the postDataToServer function. After that, it waits for 4 seconds before adding the wireless credentials to wifiMulti. When the ESP32 board runs the setup function, it defines a baud rate of 9600 for the board's serial connection. Next, an instance of WiFiMulti is created. If you are using a different set of wireless credentials, then be sure to change them. Serial.printf("Error occurred while sending HTTP POST: %s\n", httpClient.errorToString(statusCode).c_str()) įirst of all, it includes the ArduinoJson, HTTPClient and WiFiMulti libraries that we will use in the sketch.Īfter that, the sketch defines the SSID and password of the wireless access point that the ESP32 board will connect with. Int httpResponseCode = http.POST(requestBody) JsonArray data = doc.createNestedArray("data") Http.addHeader("Content-Type", "application/json") Block until we are able to connect to the WiFi access point Serial.println("Posting JSON data to server.") Given that, this is an example Arduino sketch for posting JSON data to a HTTP server endpoint from your ESP32 development board: When we send a request to, the server will respond with the data from the request. In order to simplify this post, let's use one of the endpoints from. Once you have installed the ArduinoJson library, you can then write the Arduino Sketch to post JSON data to a HTTP server endpoint. Writing the Arduino Sketch to post JSON data to a HTTP server endpoint from your ESP32 development board When the Library Manager window appeared in the foreground, search for ArduinoJson and install it: In order to do so, go to Tools -> Manage Libraries. ![]() Installing the ArduinoJson library on Arduino IDEĪfter starting your Arduino IDE, install the ArduinoJson library. After you have done so, you should be able to use the HttpClient library from your Arduino sketch to send HTTP requests. Enabling ESP32 Development on Arduino IDEīefore continuing, be sure that you have enable ESP32 Development on Arduino IDE. Given that, let us look at how we can post JSON data to a HTTP server endpoint from a ESP32 development board with ArduinoJson. In such a situation, you can consider using ArduinoJson to help you construct the JSON data. ![]() When sending data from your ESP32 development board, you may choose to send the data in JSON. How to post JSON data to a HTTP server endpoint from your ESP32 development board with ArduinoJson ![]()
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