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Sample MQTT program - simple send and receive (MQ Telemetry Transport) for GainSpan Wi-Fi module
Dependencies: C12832 GSwifiInterface MQTT mbed-rtos mbed
mbedのMQTTグループで保守されているMQTTライブラリを GainSpan Wi-Fi モジュールへ対応させたサンプルです。
MQTT (MQ Telemetry Transport) とは、IoTやM2M向け デバイス間通信のためのプロトコルです。
MQTTサーバーには http://iot.eclipse.org/ のサンドボックスを使います。 送信したメッセージをエコーバックしてくるだけの動作をします。
mbed Application Board を使う場合は次の行のコメントアウトを外すとLCDへ表示するようになる。
#define MBED_APPLICATION_BOARD
GainSpanモジュールの接続ピンについては次の行で指定する。
gs = new GSwifiInterface(p9, p10, NC, NC, p30, NC, 9600); //tx, rx, cts, rts, reset, alarm, baud
Wi-Fiアクセスポイントは次の行で指定する。
#define SEC GSwifi::SEC_WPA_PSK #define SSID "SSID" #define PASS "PASSPHRASE"
Revision 0:0cae29831d01, committed 2014-02-04
- Comitter:
- icraggs
- Date:
- Tue Feb 04 22:38:15 2014 +0000
- Child:
- 1:a1d5c7a6acbc
- Commit message:
- Sample program for MQTT client
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/C12832_lcd.lib Tue Feb 04 22:38:15 2014 +0000 @@ -0,0 +1,1 @@ +https://mbed.org/users/dreschpe/code/C12832_lcd/#8f86576007d6
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/EthernetInterface.lib Tue Feb 04 22:38:15 2014 +0000 @@ -0,0 +1,1 @@ +https://mbed.org/users/mbed_official/code/EthernetInterface/#6a67d2bddc7c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/MQTTClient.lib Tue Feb 04 22:38:15 2014 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/icraggs/code/MQTTClient/#7734401cc1b4
--- /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();
+}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Tue Feb 04 22:38:15 2014 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/a9913a65894f \ No newline at end of file