Set subscribe handler data as global

[kannnyyy]

Hi ScruffR! Thank you very much for your writing the code. I've tested it and I have no stack overflow, i will try to implement parts of it (unifying function and publish) into my code

• Why do you use const int instead of int to declare pins?
• I see that you used log.info/log.warn instead of serial.print! I'll implement that to my code so it looks neater
• I've also removed dailysparktimer and used your float hh timer instead.
• I noticed that you used wrote char msg[16] = "", strncpy(msg, "Dark", sizeof(msg)); and Particle.publish("C8_ambience", msg);
  How is this different from Particle.publish("C8_ambience", "Dark", PRIVATE);? Is the one you wrote, is a char and the one with "Dark" a string that gets converted to char (Since ambience_handler (const char *event, const char *data) )?
• Whats the difference between having a function prototype and function declaration? Does having a function prototype help to improve code speed?

I just realised i used strings in my ambience handler!! I noticed in your code you wrote the below.

void c8_Handler(const char *event, const char *data){
  Log.trace("%s: <%s>", event, data);
  if(!LITERALCMP(data, "Dark")) {

I;m trying to understand const and strings. If I replace if(ambience_status=="Dark") with if(data=="Dark"), my code still verified, however whatever is inside the if statement does not execute. I tried if(data = "Dark") and whatever inside the if statement works. Why is this so?

@kannnyyy

void myAmbienceHandler(const char *event, const char *data){
    String ambience_status = String(data);
    Serial.println("Ambience Handler executed");
    Serial.println(ambience_status);

    if(ambience_status == "Dark"){

I was wondering if writing serialprint&publish once based on LDR state every 5 seconds would allow photon to be more efficient;

Write to serial only if the state of a light sensor changes

I'm about halfway done with my project, though I'm still facing stack overflow issue with my own code.

Setting stack size

@larse, there is no way to set the stack size except for new FreeRTOS threads. Calling System.freeMemory() show he available space on the Heap but does not indicate how fragmented it is. Often, memory issues are due to using functions that dynamically allocate and release memory on the Heap, creating fragmentation. This includes some Standard Library functions (eg. <vector>) and more commonly the Arduino String commands. The solution to the latter is to use c-string (char arrays) functions. …

I managed to get the fingerprint scanner widget button on blynk working with this:

void fingerprint_scanner(){
    if (digitalRead(button) == LOW){
        Particle.publish("door_status_D8", "DOOR UNLOCKED");
    }
    else{ // HIGH
        Particle.publish("door_status_D8", "door locked");
    }
}

BLYNK_WRITE(V4){       // widget btn state opposite of physical btn state  
    if(param.asInt()){ // HIGH , param.asInt() gets value from pin V4
        Particle.publish("door_status_D8", "door locked");
    }
    else{              // LOW
        Particle.publish("door_status_D8", "DOOR UNLOCKED");
    }
}