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109 lines
2.9 KiB
C++
109 lines
2.9 KiB
C++
// ArduinoJson - arduinojson.org
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// Copyright Benoit Blanchon 2014-2018
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// MIT License
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//
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// This example shows how to implement an HTTP server that sends JSON document
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// in the responses.
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// It uses the Ethernet library but can be easily adapted for Wifi.
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//
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// It sends the value of the analog and digital pins.
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// The JSON document looks like the following:
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// {
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// "analog": [ 0, 1, 2, 3, 4, 5 ],
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// "digital": [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13 ]
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// }
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#include <ArduinoJson.h>
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#include <Ethernet.h>
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#include <SPI.h>
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byte mac[] = {0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED};
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EthernetServer server(80);
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void setup() {
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// Initialize serial port
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Serial.begin(9600);
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while (!Serial) continue;
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// Initialize Ethernet libary
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if (!Ethernet.begin(mac)) {
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Serial.println(F("Failed to initialize Ethernet library"));
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return;
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}
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// Start to listen
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server.begin();
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Serial.println(F("Server is ready."));
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Serial.print(F("Please connect to http://"));
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Serial.println(Ethernet.localIP());
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}
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void loop() {
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// Wait for an incomming connection
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EthernetClient client = server.available();
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// Do we have a client?
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if (!client) return;
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Serial.println(F("New client"));
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// Read the request (we ignore the content in this example)
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while (client.available()) client.read();
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// Allocate JsonBuffer
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// Use arduinojson.org/assistant to compute the capacity.
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StaticJsonBuffer<500> jsonBuffer;
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// Create the root object
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JsonObject& root = jsonBuffer.createObject();
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// Create the "analog" array
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JsonArray& analogValues = root.createNestedArray("analog");
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for (int pin = 0; pin < 6; pin++) {
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// Read the analog input
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int value = analogRead(pin);
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// Add the value at the end of the array
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analogValues.add(value);
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}
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// Create the "digital" array
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JsonArray& digitalValues = root.createNestedArray("digital");
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for (int pin = 0; pin < 14; pin++) {
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// Read the digital input
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int value = digitalRead(pin);
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// Add the value at the end of the array
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digitalValues.add(value);
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}
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Serial.print(F("Sending: "));
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root.printTo(Serial);
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Serial.println();
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// Write response headers
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client.println("HTTP/1.0 200 OK");
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client.println("Content-Type: application/json");
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client.println("Connection: close");
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client.println();
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// Write JSON document
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root.prettyPrintTo(client);
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// Disconnect
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client.stop();
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}
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// See also
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// --------
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//
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// The website arduinojson.org contains the documentation for all the functions
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// used above. It also includes an FAQ that will help you solve any
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// serialization problem.
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// Please check it out at: https://arduinojson.org/
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//
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// The book "Mastering ArduinoJson" contains a tutorial on serialization.
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// It begins with a simple example, then adds more features like serializing
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// directly to a file or an HTTP client.
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// Please check it out at: https://arduinojson.org/book/
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