arm mbed OS Network errors - 에러 코드

매번 찾기가 짜증난다..여기 기록.. Network errorsThe convention of the network-socket API is for functions to return negative error codes to indicate failure. On success, a function may return zero or a non-negative integer to indicate the size of a transaction. On failure, a function must return a negative integer, which should be one of the error codes in the nsapi_error_t enum (here):/** Enum of standardiz..