[209] | 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 | }
|
---|