wolf SSL / Mbed 2 deprecated HelloMQTTS

Simple usage example of MQTTS library

Dependencies:   EthernetInterface MQTTS NTPClient SDFileSystem mbed-rtos mbed wolfSSL

Fork of HelloMQTT by MQTT

MQTT is light weight protocol for M2M, IoT. MQTTS adds TLS(SSL) security layer into the MQTT. This program shows simple usage example of MQTTS library.

Connect information has to be stored in SD file "connectInfo.txt", with following lines in it.

  • Host Name
  • User Name
  • Password
  • Client ID
  • Topic

The program asks following information on the terminal

  • Port Number to be connected. If the port is >8000 it assumes MQTTS.
  • Message to be published
  • Certificate file name, if MQTTS. Input file name on SD card. Simply Return key force it to no server verification. The program set up the realtime clock by NTP for certificate verification.

This program was tested with FRDM-K64F, against Sango MQTT server by Shiguredo. https://sango.shiguredo.jp/

References:

Diff: main.cpp

Revision:
5:4a257f6ac09a
Parent:
3:7a6a899de7cc
Child:
7:3de634f2d40c
--- a/main.cpp	Fri May 09 21:33:48 2014 +0000
+++ b/main.cpp	Fri May 09 23:06:43 2014 +0000
@@ -25,121 +25,45 @@
  */
 
 #include "mbed.h"
-#include "EthernetInterface.h"
+#include "EthernetInterfaceIPStack.h"
 
-#include "C12832_lcd.h"
-C12832_LCD lcd;
+#include "C12832.h"
+C12832 lcd(p5, p7, p6, p8, p11);
 
 #include "FP.cpp"
 #include "MQTTClient.h"
 
-
-
-class IPStack 
-{
-public:    
-    IPStack()
-    {
-        eth.init();                          // Use DHCP
-        eth.connect();
-        mysock.set_blocking(false, 1000);    // 1 second Timeout 
-    }
-    
-    int connect(char* hostname, int port)
-    {
-        return mysock.connect(hostname, port);
-    }
-
-    int read(char* buffer, int len, int timeout)
-    {
-        mysock.set_blocking(false, timeout);  
-        return mysock.receive(buffer, len);
-    }
-    
-    int write(char* buffer, int len, int timeout)
-    {
-        mysock.set_blocking(false, timeout);  
-        return mysock.send(buffer, len);
-    }
-    
-    int disconnect()
-    {
-        return mysock.close();
-    }
-    
-private:
-
-    EthernetInterface eth;
-    TCPSocketConnection mysock; 
-    
-};
-
-
-class Countdown
-{
-public:
-    Countdown()
-    {
-        t = Timer();   
-    }
-    
-    Countdown(int ms)
-    {
-        t = Timer();
-        countdown_ms(ms);   
-    }
-    
-    
-    bool expired()
-    {
-        return t.read_ms() >= interval_end_ms;
-    }
-    
-    void countdown_ms(int ms)  
-    {
-        t.stop();
-        interval_end_ms = ms;
-        t.reset();
-        t.start();
-    }
-    
-    void countdown(int seconds)
-    {
-        countdown_ms(seconds * 1000);
-    }
-    
-    int left_ms()
-    {
-        return interval_end_ms - t.read_ms();
-    }
-    
-private:
-    Timer t;
-    int interval_end_ms; 
-};
-
 int arrivedcount = 0;
 
 void messageArrived(MQTT::Message* message)
 {
-    lcd.printf("Message arrived: qos %d, retained %d, dup %d, packetid %d\n", message->qos, message->retained, message->dup, message->id);
-    lcd.printf("Payload %.*s\n", message->payloadlen, (char*)message->payload);
+    lcd.cls();
+    lcd.locate(0,3);
+    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 connect(MQTT::Client<IPStack, Countdown>::connectionLostInfo* info)
 {
     char* hostname = "m2m.eclipse.org";
     int port = 1883;
-    lcd.printf("Connecting to %s:%d\n", hostname, port);
+    
+    lcd.cls();
+    lcd.locate(0,3);
+    lcd.printf("%s:%d\n", hostname, port);
+    printf("Connecting to %s:%d\n", hostname, port);
     int rc = info->network->connect(hostname, port);
-    lcd.printf("rc from TCP connect is %d\n", rc);
+    lcd.printf("TCP connect = %d\n", rc);
+    printf("rc from TCP connect is %d\n", rc);
  
     MQTTPacket_connectData data = MQTTPacket_connectData_initializer;       
     data.MQTTVersion = 3;
     data.clientID.cstring = "mbed-icraggs";
     rc = info->client->connect(&data);
-    lcd.printf("rc from MQTT connect is %d\n", rc);
+    lcd.printf("MQTT connect = %d\n", rc);
+    printf("rc from MQTT connect is %d\n", rc);
     
     return rc;
 }
@@ -152,6 +76,7 @@
     char* topic = "mbed-sample";
     
     lcd.printf("Version is %f\n", version);
+    printf("Version is %f\n", version);
               
     MQTT::Client<IPStack, Countdown> client = MQTT::Client<IPStack, Countdown>(ipstack);
     
@@ -161,8 +86,9 @@
     int rc = connect(&info);
     
     rc = client.subscribe(topic, MQTT::QOS1, messageArrived);   
-    if (rc != 0)
-        lcd.printf("rc from MQTT subscribe is %d\n", rc);
+    if (rc != 0) {
+        printf("rc from MQTT subscribe is %d\n", rc);
+    }
 
     MQTT::Message message;
 
@@ -195,16 +121,21 @@
         client.yield(100);
     
     rc = client.unsubscribe(topic);
-    if (rc != 0)
-        lcd.printf("rc from unsubscribe was %d\n", rc);
+    if (rc != 0) {
+        printf("rc from unsubscribe was %d\n", rc);
+    }
     
     rc = client.disconnect();
-    if (rc != 0)
-        lcd.printf("rc from disconnect was %d\n", rc);
+    if (rc != 0) {
+        printf("rc from disconnect was %d\n", rc);
+    }
     
     ipstack.disconnect();
     
-    lcd.printf("Finishing with %d messages received\n", arrivedcount);
+    lcd.cls();
+    lcd.locate(0,3);
+    lcd.printf("Finish: %d msgs\n", arrivedcount);
+    printf("Finishing with %d messages received\n", arrivedcount);
     
     return 0;
 }