Restored README to top level

* Fixed compile error when used with arduino-0021 or later

PubSubClient.h

@@ -1,39 +0,0 @@
-/*
- PubSubClient.h - A simple client for MQTT.
-  Nicholas O'Leary
-  http://knolleary.net
-*/
-
-#ifndef PubSubClient_h
-#define PubSubClient_h
-
-#include "Client.h"
-
-#define MAX_PACKET_SIZE 128
-#define KEEPALIVE 15000 // max value = 255000
-
-
-class PubSubClient {
-private:
-   Client _client;
-   uint8_t buffer[MAX_PACKET_SIZE];
-   uint8_t nextMsgId;
-   long lastActivity;
-   void (*callback)(char*,uint8_t*,int);
-   uint8_t readPacket();
-   int write(uint8_t header, uint8_t* buf, uint8_t length);
-   uint8_t writeString(char* string, uint8_t* buf, uint8_t pos);
-public:
-   PubSubClient(uint8_t *, uint16_t, void(*)(char*,uint8_t*,int));
-   int connect(char *);
-   int connect(char*, char*, uint8_t, uint8_t, char*);
-   void disconnect();
-   int publish(char *, char *);
-   int publish(char *, uint8_t *, uint8_t);
-   void subscribe(char *);
-   int loop();
-   int connected();
-};
-
-
-#endif

PubSubClient/CHANGES.txt

@@ -1,3 +1,16 @@
+1.6
+    * Added the ability to publish a retained message
+
+1.5
+    * Added default constructor
+    * Fixed compile error when used with arduino-0021 or later
+
+1.4
+    * Fixed connection lost handling
+
+1.3
+    * Fixed packet reading bug in PubSubClient.readPacket
+
 1.2
     * Fixed compile error when used with arduino-0016 or later
 

PubSubClient/PubSubClient.cpp

@@ -4,15 +4,12 @@
   http://knolleary.net
 */
 
-#include "WConstants.h"
 #include "PubSubClient.h"
 #include "Client.h"
 #include "string.h"
 
-#define MQTTCONNECT 1<<4
+PubSubClient::PubSubClient() : _client(0) {
-#define MQTTPUBLISH 3<<4
+}
-#define MQTTSUBSCRIBE 8<<4
-
 
 PubSubClient::PubSubClient(uint8_t *ip, uint16_t port, void (*callback)(char*,uint8_t*,int)) : _client(ip,port) {
    this->callback = callback;
@@ -22,10 +19,10 @@ int PubSubClient::connect(char *id) {
 }
 
 int PubSubClient::connect(char *id, char* willTopic, uint8_t willQos, uint8_t willRetain, char* willMessage) {
-   if (!_client.connected()) {
+   if (!connected()) {
       if (_client.connect()) {
          nextMsgId = 1;
-         uint8_t d[9] = {0x00,0x06,0x4d,0x51,0x49,0x73,0x64,0x70,0x03};
+         uint8_t d[9] = {0x00,0x06,'M','Q','I','s','d','p',MQTTPROTOCOLVERSION};
          uint8_t length = 0;
          int j;
          for (j = 0;j<9;j++) {
@@ -37,7 +34,7 @@ int PubSubClient::connect(char *id, char* willTopic, uint8_t willQos, uint8_t wi
             buffer[length++] = 0x02;
          }
          buffer[length++] = 0;
-         buffer[length++] = (KEEPALIVE/500);
+         buffer[length++] = (KEEPALIVE/1000);
          length = writeString(id,buffer,length);
          if (willTopic) {
             length = writeString(willTopic,buffer,length);
@@ -46,26 +43,30 @@ int PubSubClient::connect(char *id, char* willTopic, uint8_t willQos, uint8_t wi
          write(MQTTCONNECT,buffer,length);
          while (!_client.available()) {}
          uint8_t len = readPacket();
+         
          if (len == 4 && buffer[3] == 0) {
             lastActivity = millis();
             return 1;
          }
-         
-         _client.stop();
       }
+      _client.stop();
    }
    return 0;
 }
 
+uint8_t PubSubClient::readByte() {
+   while(!_client.available()) {}
+   return _client.read();
+}
+
 uint8_t PubSubClient::readPacket() {
    uint8_t len = 0;
-   buffer[len++] = _client.read();
+   buffer[len++] = readByte();
-   
    uint8_t multiplier = 1;
    uint8_t length = 0;
    uint8_t digit = 0;
    do {
-      digit = _client.read();
+      digit = readByte();
       buffer[len++] = digit;
       length += (digit & 127) * multiplier;
       multiplier *= 128;
@@ -74,28 +75,29 @@ uint8_t PubSubClient::readPacket() {
    for (int i = 0;i<length;i++)
    {
       if (len < MAX_PACKET_SIZE) {
-         buffer[len++] = _client.read();
+         buffer[len++] = readByte();
       } else {
-         _client.read();
+         readByte();
          len = 0; // This will cause the packet to be ignored.
       }
    }
+
    return len;
 }
 
 int PubSubClient::loop() {
-   if (_client.connected()) {
+   if (connected()) {
       long t = millis();
       if (t - lastActivity > KEEPALIVE) {
-         _client.write(192);
+         _client.write(MQTTPINGREQ);
          _client.write((uint8_t)0);
          lastActivity = t;
       }
       if (_client.available()) {
          uint8_t len = readPacket();
          if (len > 0) {
-            uint8_t type = buffer[0]>>4;
+            uint8_t type = buffer[0]&0xF0;
-            if (type == 3) { // PUBLISH
+            if (type == MQTTPUBLISH) {
                if (callback) {
                   uint8_t tl = (buffer[2]<<3)+buffer[3];
                   char topic[tl+1];
@@ -107,8 +109,8 @@ int PubSubClient::loop() {
                   uint8_t *payload = buffer+4+tl;
                   callback(topic,payload,len-4-tl);
                }
-            } else if (type == 12) { // PINGREG
+            } else if (type == MQTTPINGREQ) {
-               _client.write(208);
+               _client.write(MQTTPINGRESP);
                _client.write((uint8_t)0);
                lastActivity = t;
             }
@@ -123,16 +125,22 @@ int PubSubClient::publish(char* topic, char* payload) {
    return publish(topic,(uint8_t*)payload,strlen(payload));
 }
 
-
 int PubSubClient::publish(char* topic, uint8_t* payload, uint8_t plength) {
-   if (_client.connected()) {
+   return publish(topic, payload, plength, 0);
+}
+
+int PubSubClient::publish(char* topic, uint8_t* payload, uint8_t plength, uint8_t retained) {
+   if (connected()) {
       uint8_t length = writeString(topic,buffer,0);
       int i;
       for (i=0;i<plength;i++) {
          buffer[length++] = payload[i];
       }
-      //header |= 1; retain
+      uint8_t header = MQTTPUBLISH;
-      write(MQTTPUBLISH,buffer,length);
+      if (retained != 0) {
+         header |= 1;
+      }
+      write(header,buffer,length);
       return 1;
    }
    return 0;
@@ -142,15 +150,13 @@ int PubSubClient::publish(char* topic, uint8_t* payload, uint8_t plength) {
 int PubSubClient::write(uint8_t header, uint8_t* buf, uint8_t length) {
    _client.write(header);
    _client.write(length);
-   for (int i=0;i<length;i++) {
+   _client.write(buf,length);
-      _client.write(buf[i]);
-   }
    return 0;
 }
 
 
 void PubSubClient::subscribe(char* topic) {
-   if (_client.connected()) {
+   if (connected()) {
       uint8_t length = 2;
       nextMsgId++;
       buffer[0] = nextMsgId >> 8;
@@ -162,7 +168,7 @@ void PubSubClient::subscribe(char* topic) {
 }
 
 void PubSubClient::disconnect() {
-   _client.write(224);
+   _client.write(MQTTDISCONNECT);
    _client.write((uint8_t)0);
    _client.stop();
    lastActivity = millis();
@@ -183,7 +189,9 @@ uint8_t PubSubClient::writeString(char* string, uint8_t* buf, uint8_t pos) {
 
 
 int PubSubClient::connected() {
-   return (int)_client.connected();
+   int rc = (int)_client.connected();
+   if (!rc) _client.stop();
+   return rc;
 }
 
 

PubSubClient/PubSubClient.h

@@ -0,0 +1,59 @@
+/*
+ PubSubClient.h - A simple client for MQTT.
+  Nicholas O'Leary
+  http://knolleary.net
+*/
+
+#ifndef PubSubClient_h
+#define PubSubClient_h
+
+#include "Client.h"
+
+#define MAX_PACKET_SIZE 128
+#define KEEPALIVE 15000 // max value = 255000
+
+// from mqtt-v3r1 
+#define MQTTPROTOCOLVERSION 3
+#define MQTTCONNECT     1 << 4  // Client request to connect to Server
+#define MQTTCONNACK     2 << 4  // Connect Acknowledgment
+#define MQTTPUBLISH     3 << 4  // Publish message
+#define MQTTPUBACK      4 << 4  // Publish Acknowledgment
+#define MQTTPUBREC      5 << 4  // Publish Received (assured delivery part 1)
+#define MQTTPUBREL      6 << 4  // Publish Release (assured delivery part 2)
+#define MQTTPUBCOMP     7 << 4  // Publish Complete (assured delivery part 3)
+#define MQTTSUBSCRIBE   8 << 4  // Client Subscribe request
+#define MQTTSUBACK      9 << 4  // Subscribe Acknowledgment
+#define MQTTUNSUBSCRIBE 10 << 4 // Client Unsubscribe request
+#define MQTTUNSUBACK    11 << 4 // Unsubscribe Acknowledgment
+#define MQTTPINGREQ     12 << 4 // PING Request
+#define MQTTPINGRESP    13 << 4 // PING Response
+#define MQTTDISCONNECT  14 << 4 // Client is Disconnecting
+#define MQTTReserved    15 << 4 // Reserved
+
+class PubSubClient {
+private:
+   Client _client;
+   uint8_t buffer[MAX_PACKET_SIZE];
+   uint8_t nextMsgId;
+   long lastActivity;
+   void (*callback)(char*,uint8_t*,int);
+   uint8_t readPacket();
+   uint8_t readByte();
+   int write(uint8_t header, uint8_t* buf, uint8_t length);
+   uint8_t writeString(char* string, uint8_t* buf, uint8_t pos);
+public:
+   PubSubClient();
+   PubSubClient(uint8_t *, uint16_t, void(*)(char*,uint8_t*,int));
+   int connect(char *);
+   int connect(char*, char*, uint8_t, uint8_t, char*);
+   void disconnect();
+   int publish(char *, char *);
+   int publish(char *, uint8_t *, uint8_t);
+   int publish(char *, uint8_t *, uint8_t, uint8_t);
+   void subscribe(char *);
+   int loop();
+   int connected();
+};
+
+
+#endif

PubSubClient/examples/mqtt_basic/mqtt_basic.pde

@@ -0,0 +1,37 @@
+/*
+ Basic MQTT example 
+ 
+  - connects to an MQTT server
+  - publishes "hello world" to the topic "outTopic"
+  - subscribes to the topic "inTopic"
+*/
+
+#include <SPI.h>
+#include <Ethernet.h>
+#include <PubSubClient.h>
+
+// Update these with values suitable for your network.
+byte mac[]    = {  0xDE, 0xED, 0xBA, 0xFE, 0xFE, 0xED };
+byte server[] = { 172, 16, 0, 2 };
+byte ip[]     = { 172, 16, 0, 100 };
+
+void callback(char* topic, byte* payload,int length) {
+  // handle message arrived
+}
+
+PubSubClient client(server, 1883, callback);
+
+void setup()
+{
+  Ethernet.begin(mac, ip);
+  if (client.connect("arduinoClient")) {
+    client.publish("outTopic","hello world");
+    client.subscribe("inTopic");
+  }
+}
+
+void loop()
+{
+  client.loop();
+}
+