I have downloaded code from below linkLink of code. I am trying test code from below. I am getting warning for below code.I couldnot able to find how to sort out
#include <SPI.h>
#include <Ethernet.h>
#include <PubSubClient.h>
/* ------------------ */
/* SKETCH CREDENTIALS */
/* ------------------ */
const char *deviceId = "<D56debb6351d9d4e74e000015>"; // * set your device id (will be the MQTT client username)
const char *deviceSecret = "<Y4h+R1NRAxrhFciRhtHLj66ERSv8RExu>"; // * set your device secret (will be the MQTT client password)
const char *outTopic = "devices/<D56debb6351d9d4e74e000015>/set"; // * MQTT channel where physical updates are published
const char *inTopic = "devices/<D56debb6351d9d4e74e000015>/get"; // * MQTT channel where lelylan updates are received
const char *clientId = "<CLIENT-ID>"; // * set a random string (max 23 chars, will be the MQTT client id)
/* ------------ */
/* SKETCH LOGIC */
/* ------------ */
/* Server settings */
byte server[] = { 178, 62, 108, 47 }; // MQTT server address
/* Sample payload published to lelylan */
/* The id is the status property id of the basic light /*
/* http://lelylan.github.io/types-dashboard-ng/#/types/518be107ef539711af000001/ */
const char *payloadOn = "{\"properties\":[{\"id\":\"56debb6351d9d4e74e000015\",\"value\":\"on\"}]}";
const char *payloadOff = "{\"properties\":[{\"id\":\"56debb6351d9d4e74e000015\",\"value\":\"off\"}]}";
/* Ethernet configuration */
byte mac[] = { 0xA0, 0xA0, 0xBA, 0xAC, 0xAE, 0x12 };
EthernetClient ethClient;
/* MQTT communication */
void callback(char* topic, byte* payload, unsigned int length); // subscription callback
PubSubClient client(server, 1883, callback, ethClient); // mqtt client
/* Pins configuration */
int inPin = 2; // button
int outPin = 4; // led
/* Button and led logics */
int state = HIGH; // current state of the output pin
int reading; // current reading from the input pin
int previous = LOW; // previous reading from the input pin
long time = 0; // the last time the output pin was toggled
long debounce = 200; // the debounce time, increase if the output flickers
/* arduino setup */
void setup() {
Serial.begin(9600);
delay(500);
Ethernet.begin(mac);
Serial.print("Connected with IP: ");
Serial.println(Ethernet.localIP());
lelylanConnection(); // MQTT server connection
pinMode(inPin, INPUT); // button pin setup
pinMode(outPin, OUTPUT); // led pin setup
}
/* arduino loop */
void loop() {
lelylanConnection();
const char *value;
reading = digitalRead(inPin); // read the button state
// if the input just went from LOW and HIGH and we've waited long enough to ignore
// any noise on the circuit, toggle the output pin and remember the time
if (reading == HIGH && previous == LOW && millis() - time > debounce) {
if (state == LOW) {
Serial.println("[PHYSICAL] Led turned on");
lelylanPublish("on");
state = HIGH;
} else {
Serial.println("[PHYSICAL] Led turned off");
lelylanPublish("off");
state = LOW;
}
time = millis();
}
// effectively update the light status
digitalWrite(outPin, state);
previous = reading;
}
/* MQTT server connection */
void lelylanConnection() {
// add reconnection logics
if (!client.connected()) {
// connection to MQTT server
if (client.connect(clientId, deviceId, deviceSecret)) {
Serial.println("[PHYSICAL] Successfully connected with MQTT");
lelylanSubscribe(); // topic subscription
}
}
client.loop();
}
/* MQTT publish */
void lelylanPublish(char *value) {
if (value == "on")
client.publish(outTopic, payloadOn); // light on
else
client.publish(outTopic, payloadOff); // light off
}
/* MQTT subscribe */
void lelylanSubscribe() {
client.subscribe(inTopic);
}
/* Receive Lelylan message and confirm the physical change */
void callback(char* topic, byte* payload, unsigned int length) {
// copu the payload content into a char*
const char *json;
json = (char *) malloc(length + 1);
memcpy(json, payload, length);
json[length] = "\0";
// update the physical status and confirm the executed update
if (String(payloadOn) == String(json)) {
Serial.println("[LELYLAN] Led turned on");
lelylanPublish("on");
state = HIGH;
} else {
Serial.println("[LELYLAN] Led turned off");
lelylanPublish("off");
state = LOW;
}
digitalWrite(outPin, state);
free(json);
}
Arduino: 1.6.6 (Windows 8.1), Board: "Arduino/Genuino Uno"
C:\Users\Ajit\Desktop\IOT_Testcode\IOT_Testcode.ino: In function 'void loop()':
C:\Users\Ajit\Desktop\IOT_Testcode\IOT_Testcode.ino:77:26: warning: deprecated conversion from string constant to 'char*' [-Wwrite-strings]
lelylanPublish("on"); ^C:\Users\Ajit\Desktop\IOT_Testcode\IOT_Testcode.ino:81:27: warning: deprecated conversion from string constant to 'char*' [-Wwrite-strings]
lelylanPublish("off"); ^C:\Users\Ajit\Desktop\IOT_Testcode\IOT_Testcode.ino: In function 'void callback(char*, byte*, unsigned int)':
IOT_Testcode:124: error: invalid conversion from 'const void*' to 'void*' [-fpermissive]
memcpy(json, payload, length);
^In file included from C:\Program Files (x86)\Arduino\hardware\arduino\avr\cores\arduino/Arduino.h:25:0,
from sketch\IOT_Testcode.ino.cpp:1:c:\program files (x86)\arduino\hardware\tools\avr\avr\include\string.h:117:14: error:
initializing argument 1 of 'void* memcpy(void*, const void*, size_t)' [-fpermissive]extern void *memcpy(void *, const void *, size_t);
^IOT_Testcode:125: error: assignment of read-only location '*(json + ((sizetype)length))'
json[length] = "\0";
^IOT_Testcode:125: error: invalid conversion from 'const char*' to 'char' [-fpermissive]
C:\Users\Ajit\Desktop\IOT_Testcode\IOT_Testcode.ino:130:24: warning: deprecated conversion from string constant to 'char*' [-Wwrite-strings]
lelylanPublish("on"); ^C:\Users\Ajit\Desktop\IOT_Testcode\IOT_Testcode.ino:134:25: warning: deprecated conversion from string constant to 'char*' [-Wwrite-strings]
lelylanPublish("off"); ^IOT_Testcode:139: error: invalid conversion from 'const void*' to 'void*' [-fpermissive]
free(json);
^In file included from C:\Program Files (x86)\Arduino\hardware\arduino\avr\cores\arduino/Arduino.h:23:0,
from sketch\IOT_Testcode.ino.cpp:1:c:\program files (x86)\arduino\hardware\tools\avr\avr\include\stdlib.h:305:13: error:
initializing argument 1 of 'void free(void*)' [-fpermissive]extern void free(void *__ptr);
^exit status 1 invalid conversion from 'const void*' to 'void*' [-fpermissive]
This report would have more information with "Show verbose output during compilation" enabled in File > Preferences.
Kindly let me know how to resolve these warning
