How can I get total number of available models knowing protocol number?

[max5555]

There are two models for Gree protocol:

/// Gree A/C model numbers
enum gree_ac_remote_model_t {
  YAW1F = 1,  // (1) Ultimate, EKOKAI, RusClimate (Default)
  YBOFB,     // (2) Green, YBOFB2, YAPOF3
};

and 6 for Panasonic

/// Panasonic A/C model numbers
enum panasonic_ac_remote_model_t {
  kPanasonicUnknown = 0,
  kPanasonicLke = 1,
  kPanasonicNke = 2,
  kPanasonicDke = 3,  // PKR too.
  kPanasonicJke = 4,
  kPanasonicCkp = 5,
  kPanasonicRkr = 6,
};

How can I get the number of available models (2) knowing protocol number for GREE (Protocol 24)?

[crankyoldgit]

There is no standard or easy way.
You could write code to (ab)use irutils::modelToStr();
i.e. (Untested Code):

uint16_t howmanymodels(const decode_type_t protocol) {
  uint16_t model_count = 0;
  while (irutils::modelToStr(protocol, model_count) != kUnknownStr) {  
    model_count++;
  }
  return model_count;
}