How to use Timer inside a C++ class

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How can we use Particle.function from within a class?

Compared to a regular function pointer (which is a single pointer) a class function is actually 2 pointers - the function itself and the ‘this’ pointer. The simplest way to encapsulate both of these so to use a lambda expression. class MyClass { void begin() { Particle.function("myfunc", [this](const String& s)->int{return doIt(s); }); } int doIt(String arg) { return 0; } };