Particle.io Callback Variable Testing

main.cpp

#include <Particle.h>

static char* var_str = (char *)"ORIG STR";
static int var_int = 1;
static double var_double = 1.23;
static double override_double;

static const void* static_str_test(const char* name, Spark_Data_TypeDef type,
        const void* var, void *reserverd) {
    return "STATIC UPDATE";
}

static const void* dynamic_int_test(const char* name, Spark_Data_TypeDef type,
        const void* var, void *reserverd) {
    *((int *)var) += 1;
    return var;
}

static const void* static_double_test(const char* name, Spark_Data_TypeDef type,
        const void* var, void *reservered) {
    override_double = 2.34;
    return &override_double;
}
    
void setup() {

    spark_variable_t extra_str;
    extra_str.size = sizeof(extra_str);
    extra_str.update = static_str_test;
    spark_variable("str", (void *)var_str, CloudVariableTypeString::value(), &extra_str);

    spark_variable_t extra_int;
    extra_int.size = sizeof(extra_int);
    extra_int.update = dynamic_int_test;
    spark_variable("int", (void *)&var_int, CloudVariableTypeInt::value(), &extra_int);

    spark_variable_t extra_double;
    extra_double.size = sizeof(extra_double);
    extra_double.update = static_double_test;
    spark_variable("double", (void *)&var_double, CloudVariableTypeDouble::value(), &extra_double);
}

void loop() {
}