add coap client example

Author: chavee

Examples/CoAPClient/CoAPClient.ino

@@ -0,0 +1,44 @@
+#include <Arduino.h>
+#include <AltSoftSerial.h>
+#include "BC95Udp.h"
+#include "CoAP.h"
+
+AltSoftSerial bc95serial;
+
+BC95UDP udp;
+Coap coap(udp);
+
+void responseHandler(CoapPacket *packet, IPAddress remoteIP, int remotePort) {
+    char buff[6];
+
+    Serial.print("CoAP Response Code: ");
+    sprintf(buff, "%d.%02d \n", packet->code >> 5, packet->code & 0b00011111);
+    Serial.print(buff);
+
+    for (int i=0; i< packet->payloadlen; i++) {
+        Serial.print((char) (packet->payload[i]));
+    }
+}
+
+void setup() {
+    bc95serial.begin(9600);
+    BC95.begin(bc95serial);
+    BC95.reset();
+
+    Serial.begin(9600);
+    Serial.println(F("Starting..."));
+
+    while (!BC95.attachNetwork()) {
+        Serial.println("...");
+        delay(1000);
+    }
+    Serial.println(F("NB-IOT attached.."));
+
+    coap.response(responseHandler);
+    coap.start();
+    coap.get("coap.me", 5683, "/hello");
+}
+
+void loop() {
+    coap.loop();
+}