replaced all string pointers with array notation

README.md

@@ -35,8 +35,8 @@ Initialize the object using the hostname of the broker, the brokers port (defaul
 
 ```c++
 void begin(Client& client);
-void begin(const char *hostname, Client &client);
-void begin(const char *hostname, int port, Client &client);
+void begin(const char hostname[], Client &client);
+void begin(const char hostname[], int port, Client &client);
 ```
 
 - Specify port `8883` when using SSL clients for secure connections.
@@ -45,24 +45,24 @@ void begin(const char *hostname, int port, Client &client);
 The hostname and port can also be changed after calling `begin()`:
 
 ```c++
-void setHost(const char *hostname);
-void setHost(const char *hostname, int port);
+void setHost(const char hostname[]);
+void setHost(const char hostname[], int port);
 ```
 
 Set a will message (last testament) that gets registered on the broker after connecting:
 
 ```c++
-void setWill(const char *topic);
-void setWill(const char *topic, const char *payload);
-void setWill(const char *topic, const char *payload, bool retained, int qos);
+void setWill(const char topic[]);
+void setWill(const char topic[], const char payload[]);
+void setWill(const char topic[], const char payload[], bool retained, int qos);
 void clearWill();
 ```
 
 Connect to broker using the supplied client id and an optional username and password:
 
 ```c++
-boolean connect(const char *clientId);
-boolean connect(const char *clientId, const char *username, const char *password);
+boolean connect(const char clientId[]);
+boolean connect(const char clientId[], const char username[], const char password[]);
 ```
 
 - This functions returns a boolean that indicates if the connection has been established successfully.
@@ -71,31 +71,31 @@ Publishes a message to the broker with an optional payload:
 
 ```c++
 boolean publish(String topic);
-boolean publish(const char *topic);
+boolean publish(const char topic[]);
 boolean publish(String topic, String payload);
 boolean publish(String topic, String payload, bool retained, int qos);
-boolean publish(const char *topic, String payload);
-boolean publish(const char *topic, String payload, bool retained, int qos);
-boolean publish(const char *topic, const char *payload);
-boolean publish(const char *topic, const char *payload, bool retained, int qos);
-boolean publish(const char *topic, char *payload, unsigned int length);
-boolean publish(const char *topic, char *payload, unsigned int length, bool retained, int qos);
+boolean publish(const char topic[], String payload);
+boolean publish(const char topic[], String payload, bool retained, int qos);
+boolean publish(const char topic[], const char payload[]);
+boolean publish(const char topic[], const char payload[], bool retained, int qos);
+boolean publish(const char topic[], char payload[], unsigned int length);
+boolean publish(const char topic[], char payload[], unsigned int length, bool retained, int qos);
 ```
 
 Subscribe to a topic:
 
 ```c++
 boolean subscribe(String topic);
 boolean subscribe(String topic, int qos); 
-boolean subscribe(const char *topic);
-boolean subscribe(const char *topic, int qos);
+boolean subscribe(const char topic[]);
+boolean subscribe(const char topic[], int qos);
 ```
 
 Unsubscribe from a topic:
 
 ```c++
 boolean unsubscribe(String topic);
-boolean unsubscribe(const char *topic);
+boolean unsubscribe(const char topic[]);
 ```
 
 Sends and receives packets:

examples/AdafruitHuzzahESP8266/AdafruitHuzzahESP8266.ino

@@ -10,8 +10,8 @@
 #include <ESP8266WiFi.h>
 #include <MQTTClient.h>
 
-const char *ssid = "ssid";
-const char *pass = "pass";
+const char ssid[] = "ssid";
+const char pass[] = "pass";
 
 WiFiClient net;
 MQTTClient client;

examples/AdafruitHuzzahESP8266_SSL/AdafruitHuzzahESP8266_SSL.ino

@@ -10,8 +10,8 @@
 #include <ESP8266WiFi.h>
 #include <MQTTClient.h>
 
-const char *ssid = "ssid";
-const char *pass = "pass";
+const char ssid[] = "ssid";
+const char pass[] = "pass";
 
 WiFiClientSecure net;
 MQTTClient client;

examples/ESP32DevelopmentBoard/ESP32DevelopmentBoard.ino

@@ -10,8 +10,8 @@
 #include <MQTTClient.h>
 #include <WiFi.h>
 
-const char *ssid = "ssid";
-const char *pass = "pass";
+const char ssid[] = "ssid";
+const char pass[] = "pass";
 
 WiFiClient net;
 MQTTClient client;

examples/ESP32DevelopmentBoard_SSL/ESP32DevelopmentBoard_SSL.ino

@@ -10,8 +10,8 @@
 #include <MQTTClient.h>
 #include <WiFiClientSecure.h>
 
-const char *ssid = "ssid";
-const char *pass = "pass";
+const char ssid[] = "ssid";
+const char pass[] = "pass";
 
 WiFiClientSecure net;
 MQTTClient client;

src/MQTTClient.h

@@ -56,9 +56,9 @@ class AdvancedMQTTClient {
 
   void begin(Client &client) { this->begin("", client); }
 
-  void begin(const char *hostname, Client &client) { this->begin(hostname, 1883, client); }
+  void begin(const char hostname[], Client &client) { this->begin(hostname, 1883, client); }
 
-  void begin(const char *hostname, int port, Client &client) {
+  void begin(const char hostname[], int port, Client &client) {
     // set config
     this->hostname = hostname;
     this->port = port;
@@ -85,18 +85,18 @@ class AdvancedMQTTClient {
     lwmqtt_set_callback(&this->client, (void *)cb, MQTTClient_callback);
   }
 
-  void setHost(const char *hostname) { this->setHost(hostname, 1883); }
+  void setHost(const char hostname[]) { this->setHost(hostname, 1883); }
 
-  void setHost(const char *hostname, int port) {
+  void setHost(const char hostname[], int port) {
     this->hostname = hostname;
     this->port = port;
   }
 
-  void setWill(const char *topic) { this->setWill(topic, ""); }
+  void setWill(const char topic[]) { this->setWill(topic, ""); }
 
-  void setWill(const char *topic, const char *payload) { this->setWill(topic, payload, false, 0); }
+  void setWill(const char topic[], const char payload[]) { this->setWill(topic, payload, false, 0); }
 
-  void setWill(const char *topic, const char *payload, bool retained, int qos) {
+  void setWill(const char topic[], const char payload[], bool retained, int qos) {
     this->hasWill = true;
     this->will.topic = lwmqtt_str(topic);
     this->will.payload = (void *)payload;
@@ -107,9 +107,9 @@ class AdvancedMQTTClient {
 
   void clearWill() { this->hasWill = false; }
 
-  boolean connect(const char *clientId) { return this->connect(clientId, NULL, NULL); }
+  boolean connect(const char clientId[]) { return this->connect(clientId, NULL, NULL); }
 
-  boolean connect(const char *clientId, const char *username, const char *password) {
+  boolean connect(const char clientId[], const char username[], const char password[]) {
     // return immediately if connected
     if (this->connected()) {
       return false;
@@ -152,33 +152,33 @@ class AdvancedMQTTClient {
 
   boolean publish(String topic) { return this->publish(topic.c_str(), ""); }
 
-  boolean publish(const char *topic) { return this->publish(topic, ""); }
+  boolean publish(const char topic[]) { return this->publish(topic, ""); }
 
   boolean publish(String topic, String payload) { return this->publish(topic.c_str(), payload.c_str()); }
 
   boolean publish(String topic, String payload, bool retained, int qos) {
     return this->publish(topic.c_str(), payload.c_str(), retained, qos);
   }
 
-  boolean publish(const char *topic, String payload) { return this->publish(topic, payload.c_str()); }
+  boolean publish(const char topic[], String payload) { return this->publish(topic, payload.c_str()); }
 
-  boolean publish(const char *topic, String payload, bool retained, int qos) {
+  boolean publish(const char topic[], String payload, bool retained, int qos) {
     return this->publish(topic, payload.c_str(), retained, qos);
   }
 
-  boolean publish(const char *topic, const char *payload) {
+  boolean publish(const char topic[], const char payload[]) {
     return this->publish(topic, (char *)payload, (unsigned int)strlen(payload));
   }
 
-  boolean publish(const char *topic, const char *payload, bool retained, int qos) {
+  boolean publish(const char topic[], const char payload[], bool retained, int qos) {
     return this->publish(topic, (char *)payload, (unsigned int)strlen(payload), retained, qos);
   }
 
-  boolean publish(const char *topic, char *payload, unsigned int length) {
+  boolean publish(const char topic[], char payload[], unsigned int length) {
     return this->publish(topic, payload, length, false, 0);
   }
 
-  boolean publish(const char *topic, char *payload, unsigned int length, bool retained, int qos) {
+  boolean publish(const char topic[], char payload[], unsigned int length, bool retained, int qos) {
     // return immediately if not connected
     if (!this->connected()) {
       return false;
@@ -205,9 +205,9 @@ class AdvancedMQTTClient {
 
   boolean subscribe(String topic, int qos) { return this->subscribe(topic.c_str(), qos); }
 
-  boolean subscribe(const char *topic) { this->subscribe(topic, 0); }
+  boolean subscribe(const char topic[]) { this->subscribe(topic, 0); }
 
-  boolean subscribe(const char *topic, int qos) {
+  boolean subscribe(const char topic[], int qos) {
     // return immediately if not connected
     if (!this->connected()) {
       return false;
@@ -225,7 +225,7 @@ class AdvancedMQTTClient {
 
   boolean unsubscribe(String topic) { return this->unsubscribe(topic.c_str()); }
 
-  boolean unsubscribe(const char *topic) {
+  boolean unsubscribe(const char topic[]) {
     // return immediately if not connected
     if (!this->connected()) {
       return false;