mongoose/docs/c-api/mg_coap.h/struct_mg_coap_message.md

title	decl_name	symbol_kind	signature
struct mg_coap_message	struct mg_coap_message	struct	struct mg_coap_message { uint32_t flags; uint8_t msg_type; uint8_t code_class; uint8_t code_detail; uint16_t msg_id; struct mg_str token; struct mg_coap_option *options; struct mg_str payload; struct mg_coap_option *optiomg_tail; };

CoAP message. See RFC 7252 for details.