added a sample REST API HTTP Request POST with encoded JSON Data

takeruadelbert · takeruadelbert · commit b3951043974c · 2018-10-10T14:58:24.000+07:00
diff --git a/REST-API-POST/REST-API-POST.ino b/REST-API-POST/REST-API-POST.ino
@@ -0,0 +1,96 @@
+#include <SPI.h>
+#include <Ethernet.h>
+#include <ArduinoJson.h>
+
+byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
+IPAddress my_ip(192,168,1,75);
+IPAddress server(192,168,1,201);
+
+EthernetClient client;
+
+String params;
+StaticJsonBuffer<200> jsonBuffer;
+
+void setup() {
+  int monitor_serial = 9600;
+  Serial.begin(monitor_serial);
+
+  // wait for serial port to connect
+  while(!Serial) {
+    
+  }
+
+  Ethernet.begin(mac, my_ip);
+
+  params = "value1=";
+  params.concat(5);
+  params.concat("&value=");
+  params.concat(10);
+
+  // parse String to JSON Object
+  JsonObject& root = jsonBuffer.createObject();
+  root["value"] = 5;
+  root["value2"] = 10;
+
+  // this is example for creating nested array data
+//  JsonArray& data = root.createNestedArray("data");
+//  data.add(123);
+//  data.add(321);
+
+  // this is for printing json encoded to serial
+  // root.printTo(Serial);
+
+  Serial.print("My IP Address : ");
+  Serial.println(my_ip);
+  Serial.print("Destination Server : ");
+  Serial.println(server);
+  Serial.println("Connecting ...");
+  delay(3000);
+
+  // connect to server with standard port 80
+  if(client.connect(server,80)) {
+    Serial.println("Connected.");
+    Serial.println();
+    delay(1000);
+
+    Serial.println("Sending Data ...");
+
+    // write http request
+    client.println("POST /epass-passenger/api/post HTTP/1.1");
+    Serial.println("POST /epass-passenger/api/post HTTP/1.1");
+    client.print("Host : ");
+    client.println(server);
+    client.println("Content Type : application/x-www-form-urlencoded");
+    client.println("Connection : close");
+    client.println("User-Agent : Arduino/1.0");
+    client.print("Content-Length : ");
+    client.println(root.measureLength());
+    client.println();
+    Serial.print("Sent Data : ");
+    root.printTo(client);
+    root.printTo(Serial);
+    client.println();
+    Serial.println();
+  } else {
+    Serial.print("Cannot connect to ");
+    Serial.println(server);
+  }
+}
+
+void loop() {
+  if(client.available()) {
+    char c = client.read();
+    Serial.print(c);
+  }
+  
+  if(!client.connected()) {
+    Serial.println();    
+    Serial.println("Disconnecting ...");
+    delay(3000);
+    client.stop();
+    Serial.println("Disconnected.");
+    while(true) {
+      delay(1);
+    }        
+  }  
+}
