Sample MQTT program - simple send and receive (MQ Telemetry Transport) for GainSpan Wi-Fi module
Dependencies: C12832 GSwifiInterface MQTT mbed-rtos mbed
Fork of HelloMQTT by
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"
main.cpp
- Committer:
- gsfan
- Date:
- 2014-10-02
- Revision:
- 16:fd155e824a80
- Parent:
- 12:086a9314e8a5
File content as of revision 16:fd155e824a80:
/******************************************************************************* * Copyright (c) 2014 IBM Corp. * * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * and Eclipse Distribution License v1.0 which accompany this distribution. * * The Eclipse Public License is available at * http://www.eclipse.org/legal/epl-v10.html * and the Eclipse Distribution License is available at * http://www.eclipse.org/org/documents/edl-v10.php. * * Contributors: * Ian Craggs - initial API and implementation and/or initial documentation *******************************************************************************/ /** This is a sample program to illustrate the use of the MQTT Client library on the mbed platform. The Client class requires two classes which mediate access to system interfaces for networking and timing. As long as these two classes provide the required public programming interfaces, it does not matter what facilities they use underneath. In this program, they use the mbed system libraries. */ /* * Supported for GsinSpan Wi-Fi Module. * Modified by gsfan * src: http://developer.mbed.org/teams/mqtt/code/HelloMQTT/ */ #include "mbed.h" #include "GSwifiInterface.h" //#define MBED_APPLICATION_BOARD #define SEC GSwifi::SEC_WPA_PSK #define SSID "SSID" #define PASS "PASSPHRASE" #ifdef MBED_APPLICATION_BOARD #include "C12832.h" C12832 lcd(p5, p7, p6, p8, p11); #else #define lcd pc #endif #include "MQTTGSwifi.h" #include "MQTTClient.h" int arrivedcount = 0; GSwifiInterface *gs; Serial pc(USBTX, USBRX); void messageArrived(MQTT::MessageData& md) { MQTT::Message &message = md.message; #ifdef MBED_APPLICATION_BOARD lcd.cls(); lcd.locate(0,3); #endif printf("Message arrived: qos %d, retained %d, dup %d, packetid %d\n", message.qos, message.retained, message.dup, message.id); printf("Payload %.*s\n", message.payloadlen, (char*)message.payload); ++arrivedcount; lcd.puts((char*)message.payload); } int main(int argc, char* argv[]) { pc.baud(115200); // gs = new GSwifiInterface(p13, p14, p12, P0_22, p21, NC, 115200); //tx, rx, cts, rts, reset, alarm, baud gs = new GSwifiInterface(p9, p10, NC, NC, p30, NC, 9600); //tx, rx, cts, rts, reset, alarm, baud wait_ms(200); lcd.printf("Connecting...\n"); gs->init(); //Use DHCP if (gs->connect(SEC, SSID, PASS)) return -1; // join the network lcd.printf("IP Address is %s\n", gs->getIPAddress()); MQTTGSwifi ipstack = MQTTGSwifi(gs); float version = 0.47; char* topic = "mbed-sample"; lcd.printf("Version is %f\n", version); printf("Version is %f\n", version); MQTT::Client<MQTTGSwifi, Countdown> client = MQTT::Client<MQTTGSwifi, Countdown>(ipstack); char* hostname = "m2m.eclipse.org"; int port = 1883; lcd.printf("Connecting to %s:%d\n", hostname, port); int rc = ipstack.connect(hostname, port); if (rc != 0) lcd.printf("rc from TCP connect is %d\n", rc); MQTTPacket_connectData data = MQTTPacket_connectData_initializer; data.MQTTVersion = 3; data.clientID.cstring = "mbed-sample"; data.username.cstring = "testuser"; data.password.cstring = "testpassword"; if ((rc = client.connect(&data)) != 0) lcd.printf("rc from MQTT connect is %d\n", rc); if ((rc = client.subscribe(topic, MQTT::QOS1, messageArrived)) != 0) lcd.printf("rc from MQTT subscribe is %d\n", rc); MQTT::Message message; // QoS 0 char buf[100]; sprintf(buf, "Hello World! QoS 0 message from app version %f\n", version); message.qos = MQTT::QOS0; message.retained = false; message.dup = false; message.payload = (void*)buf; message.payloadlen = strlen(buf)+1; rc = client.publish(topic, &message); while (arrivedcount < 1) client.yield(100); // QoS 1 sprintf(buf, "Hello World! QoS 1 message from app version %f\n", version); message.qos = MQTT::QOS1; message.payloadlen = strlen(buf)+1; rc = client.publish(topic, &message); while (arrivedcount < 2) client.yield(100); // QoS 2 sprintf(buf, "Hello World! QoS 2 message from app version %f\n", version); message.qos = MQTT::QOS2; message.payloadlen = strlen(buf)+1; rc = client.publish(topic, &message); while (arrivedcount < 3) client.yield(100); // n * QoS 2 for (int i = 1; i <= 10; ++i) { sprintf(buf, "Hello World! QoS 2 message number %d from app version %f\n", i, version); message.qos = MQTT::QOS2; message.payloadlen = strlen(buf)+1; rc = client.publish(topic, &message); while (arrivedcount < i + 3) client.yield(100); } if ((rc = client.unsubscribe(topic)) != 0) printf("rc from unsubscribe was %d\n", rc); if ((rc = client.disconnect()) != 0) printf("rc from disconnect was %d\n", rc); ipstack.disconnect(); #ifdef MBED_APPLICATION_BOARD lcd.cls(); lcd.locate(0,3); #endif lcd.printf("Version %.2f: finish %d msgs\n", version, arrivedcount); printf("Finishing with %d messages received\n", arrivedcount); return 0; }