JsonHttpClient.ino

// ArduinoJson - arduinojson.org // Copyright Benoit Blanchon 2014-2018 // MIT License #include <ArduinoJson.h> #include <Ethernet.h> #include <SPI.h>  void setup() { // Initialize Serial port Serial.begin(9600); while (!Serial) continue; // Initialize Ethernet library byte mac[] = {0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED}; if (!Ethernet.begin(mac)) { Serial.println(F("Failed to configure Ethernet")); return; } delay(1000); Serial.println(F("Connecting...")); // Connect to HTTP server EthernetClient client; client.setTimeout(10000); if (!client.connect("arduinojson.org", 80)) { Serial.println(F("Connection failed")); return; } Serial.println(F("Connected!")); // Send HTTP request client.println(F("GET /example.json HTTP/1.0")); client.println(F("Host: arduinojson.org")); client.println(F("Connection: close")); if (client.println() == 0) { Serial.println(F("Failed to send request")); return; } // Check HTTP status char status[32] = {0}; client.readBytesUntil('\r', status, sizeof(status)); if (strcmp(status, "HTTP/1.1 200 OK") != 0) { Serial.print(F("Unexpected response: ")); Serial.println(status); return; } // Skip HTTP headers char endOfHeaders[] = "\r\n\r\n"; if (!client.find(endOfHeaders)) { Serial.println(F("Invalid response")); return; } // Allocate JsonBuffer // Use arduinojson.org/assistant to compute the capacity. const size_t capacity = JSON_OBJECT_SIZE(3) + JSON_ARRAY_SIZE(2) + 60; DynamicJsonBuffer jsonBuffer(capacity); // Parse JSON object JsonObject& root = jsonBuffer.parseObject(client); if (!root.success()) { Serial.println(F("Parsing failed!")); return; } // Extract values Serial.println(F("Response:")); Serial.println(root["sensor"].as<char*>()); Serial.println(root["time"].as<char*>()); Serial.println(root["data"][0].as<char*>()); Serial.println(root["data"][1].as<char*>()); // Disconnect client.stop(); } void loop() { // not used in this example }