Add int, long & float publication capability

PubSubClient/CHANGES.txt

@@ -1,3 +1,6 @@
+1.9.1
+   * Add functions to publish int, float, long. Handles type conversion. Added for flexibility
+
 1.9
    * Do not split MQTT packets over multiple calls to _client->write()
    * API change: All constructors now require an instance of Client

PubSubClient/PubSubClient.cpp

@@ -124,7 +124,7 @@ uint8_t PubSubClient::readByte() {
 uint16_t PubSubClient::readPacket(uint8_t* lengthLength) {
    uint16_t len = 0;
    buffer[len++] = readByte();
-   uint8_t multiplier = 1;
+   uint32_t multiplier = 1;
    uint16_t length = 0;
    uint8_t digit = 0;
    do {
@@ -203,6 +203,25 @@ boolean PubSubClient::publish(char* topic, uint8_t* payload, unsigned int plengt
    return publish(topic, payload, plength, false);
 }
 
+boolean PubSubClient::publish(char* topic, float payload, boolean retained, unsigned int minlength, unsigned int precision) {
+	if (minlength < 4 && payload < 0) minlength = 4; // 4 = sign + 1 integral digit + fractional point + 1 franctional digit
+	char mqtt_messagebuff[longNbDigits((long) payload) + 1 + precision + 1];
+
+	dtostrf(payload, minlength, precision, mqtt_messagebuff);
+	return publish(topic, (uint8_t*)mqtt_messagebuff, strlen(mqtt_messagebuff), retained);
+}
+
+boolean PubSubClient::publish(char* topic, int payload, boolean retained) {
+	return publish(topic, (long)payload, retained);
+}
+
+boolean PubSubClient::publish(char* topic, long payload, boolean retained) {
+	char mqtt_messagebuff[longNbDigits(payload) + 1]; //number of digits including sign + null terminaison
+
+	itoa(payload, mqtt_messagebuff, 10);
+	return publish(topic, (uint8_t*)mqtt_messagebuff, strlen(mqtt_messagebuff), retained);
+}
+
 boolean PubSubClient::publish(char* topic, uint8_t* payload, unsigned int plength, boolean retained) {
    if (connected()) {
       // Leave room in the buffer for header and variable length field
@@ -357,3 +376,8 @@ boolean PubSubClient::connected() {
    return rc;
 }
 
+unsigned int PubSubClient::longNbDigits (long number) {
+	if (number < 0 ) return 1 + longNbDigits (abs(number));
+	if (number < 10) return 1;
+	return 1 + longNbDigits (number / 10);
+}

PubSubClient/PubSubClient.h

@@ -53,6 +53,7 @@ class PubSubClient {
    uint8_t *ip;
    char* domain;
    uint16_t port;
+   unsigned int longNbDigits (long);
 public:
    PubSubClient();
    PubSubClient(uint8_t *, uint16_t, void(*)(char*,uint8_t*,unsigned int),Client& client);
@@ -65,6 +66,9 @@ class PubSubClient {
    boolean publish(char *, char *);
    boolean publish(char *, uint8_t *, unsigned int);
    boolean publish(char *, uint8_t *, unsigned int, boolean);
+   boolean publish(char *, float, boolean, unsigned int, unsigned int);
+   boolean publish(char *, int, boolean);
+   boolean publish(char *, long, boolean);
    boolean publish_P(char *, uint8_t PROGMEM *, unsigned int, boolean);
    boolean subscribe(char *);
    boolean unsubscribe(char *);