ESP8266
Example MQTT implemented on the ESP8266
Dependencies: ESP8266Interface MQTT mbed-rtos mbed
This is an example of how to run MQTT using the esp8266 as the network connection. This program will default to trying to talk to a public MQTT server (test.mosquitto.org). The example will subscribe to a topic and then publish to that topic. In this way it will effectively echo back to itself. You can alternatively use a private mqtt broker,[[TODO: |instructions here]]
Please note that the ESP8266 interface cannot translate hostnames to IP Addresses, it can only accept raw IP Addresses as input.
Diff: main.cpp
- Revision:
- 0:0cae29831d01
- Child:
- 1:a1d5c7a6acbc
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Tue Feb 04 22:38:15 2014 +0000
@@ -0,0 +1,72 @@
+#include "mbed.h"
+#include "EthernetInterface.h"
+#include "C12832_lcd.h"
+
+#include "MQTTPacket.h"
+
+
+DigitalOut myled(LED2);
+C12832_LCD lcd;
+
+int publish()
+{
+ MQTTPacket_connectData data = MQTTPacket_connectData_initializer;
+ int rc = 0;
+ char buf[200];
+ int buflen = sizeof(buf);
+ TCPSocketConnection mysock;
+ MQTTString topicString = MQTTString_initializer;
+ char* payload = "I'm alive!";
+ int payloadlen = strlen(payload);
+ int len = 0;
+
+ mysock.connect("m2m.eclipse.org", 1883);
+
+ data.clientID.cstring = "mbed test client - Ian Craggs";
+ data.keepAliveInterval = 20;
+ data.cleansession = 1;
+ data.MQTTVersion = 3;
+
+ len = MQTTSerialize_connect(buf, buflen, &data);
+
+ topicString.cstring = "mbed NXP LPC1768";
+ len += MQTTSerialize_publish(buf + len, buflen - len, 0, 0, 0, 0, topicString, payload, payloadlen);
+
+ len += MQTTSerialize_disconnect(buf + len, buflen - len);
+
+ rc = 0;
+ while (rc < len)
+ {
+ int rc1 = mysock.send(buf, len);
+ if (rc1 == -1)
+ {
+ lcd.printf("Send failed\n");
+ break;
+ }
+ else
+ rc += rc1;
+ }
+ if (rc == len)
+ lcd.printf("Send succeeded\n");
+ wait(0.2);
+
+ return 0;
+}
+
+int main() {
+ EthernetInterface eth;
+ eth.init(); //Use DHCP
+ eth.connect();
+ lcd.printf("IP Address is %s\n", eth.getIPAddress());
+
+ while(1) {
+ myled = 1;
+ publish();
+ wait(0.2);
+ myled = 0;
+ publish();
+ wait(0.2);
+ }
+
+ eth.disconnect();
+}