I need to have an interface to the driver that provides a set of send() functions only of the following types:

void send(u8 a);
void send(u8 a, u8 b);
void send(u8 a, u8 b, u8 c);
void send(u8 *a, u32 size);

I want to shorten the appearance of this interface and implement it using variable templates.
As you can see, it is required, firstly, to check whether the first argument is a pointer, and if so, then handle this case separately. In other cases, you must prevent entering more than 3 arguments of type u8 (unsigned char).

I’m completely confused with the use of enable_if, SFINAE, etc.

My example:

template<typename ...Args>
void send(Args... args) {
}

void send(u8 *p, u32 size) {
}

int main() {
  u8 b;

  send(1);              // OK
  send(1, 2);           // OK
  send(1, 2, 3);        // OK

  send('1', '2', 3, 4); // NOT OK: 4 arguments were passed, I need a maximum of 3

  send(&b, 10);         // NOT OK: call template 'send', not specialized 'send(u8 *p, u32 size)'
}

Is this possible?