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| 1 | +// Sample Arduino Json Web Server |
| 2 | +// Created by Benoit Blanchon. |
| 3 | +// Heavily inspired by "Web Server" from David A. Mellis and Tom Igoe |
| 4 | + |
| 5 | +#include <SPI.h> |
| 6 | +#include <Ethernet.h> |
| 7 | +#include <ArduinoJson.h> |
| 8 | + |
| 9 | +byte mac[] = {0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED}; |
| 10 | +IPAddress ip(192, 168, 0, 177); |
| 11 | +EthernetServer server(80); |
| 12 | + |
| 13 | +bool readRequest(EthernetClient& client) { |
| 14 | + bool currentLineIsBlank = true; |
| 15 | + while (client.connected()) { |
| 16 | + if (client.available()) { |
| 17 | + char c = client.read(); |
| 18 | + if (c == '\n' && currentLineIsBlank) { |
| 19 | + return true; |
| 20 | + } else if (c == '\n') { |
| 21 | + currentLineIsBlank = true; |
| 22 | + } else if (c != '\r') { |
| 23 | + currentLineIsBlank = false; |
| 24 | + } |
| 25 | + } |
| 26 | + } |
| 27 | + return false; |
| 28 | +} |
| 29 | + |
| 30 | +JsonObject& prepareResponse(JsonBuffer& jsonBuffer) { |
| 31 | + JsonObject& root = jsonBuffer.createObject(); |
| 32 | + |
| 33 | + JsonArray& analogValues = root.createNestedArray("analog"); |
| 34 | + for (int pin = 0; pin < 6; pin++) { |
| 35 | + int value = analogRead(pin); |
| 36 | + analogValues.add(value); |
| 37 | + } |
| 38 | + |
| 39 | + JsonArray& digitalValues = root.createNestedArray("digital"); |
| 40 | + for (int pin = 0; pin < 14; pin++) { |
| 41 | + int value = digitalRead(pin); |
| 42 | + digitalValues.add(value); |
| 43 | + } |
| 44 | + |
| 45 | + return root; |
| 46 | +} |
| 47 | + |
| 48 | +void writeResponse(EthernetClient& client, JsonObject& json) { |
| 49 | + client.println("HTTP/1.1 200 OK"); |
| 50 | + client.println("Content-Type: application/json"); |
| 51 | + client.println("Connection: close"); |
| 52 | + client.println(); |
| 53 | + |
| 54 | + json.prettyPrintTo(client); |
| 55 | +} |
| 56 | + |
| 57 | +void setup() { |
| 58 | + Ethernet.begin(mac, ip); |
| 59 | + server.begin(); |
| 60 | +} |
| 61 | + |
| 62 | +void loop() { |
| 63 | + EthernetClient client = server.available(); |
| 64 | + if (client) { |
| 65 | + bool success = readRequest(client); |
| 66 | + if (success) { |
| 67 | + StaticJsonBuffer<500> jsonBuffer; |
| 68 | + JsonObject& json = prepareResponse(jsonBuffer); |
| 69 | + writeResponse(client, json); |
| 70 | + } |
| 71 | + delay(1); |
| 72 | + client.stop(); |
| 73 | + } |
| 74 | +} |
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