arm mbed OS Network errors - 에러 코드

매번 찾기가 짜증난다..여기 기록..

Network errors

The 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 standardized error codes 
 *
 *  Valid error codes have negative values and may
 *  be returned by any network operation.
 *
 *  @enum nsapi_error_t
 */
typedef enum nsapi_error {
    NSAPI_ERROR_WOULD_BLOCK   = -3001,     /*!< data is not available but call is non-blocking */
    NSAPI_ERROR_UNSUPPORTED   = -3002,     /*!< unsupported functionality */
    NSAPI_ERROR_PARAMETER     = -3003,     /*!< invalid configuration */
    NSAPI_ERROR_NO_CONNECTION = -3004,     /*!< not connected to a network */
    NSAPI_ERROR_NO_SOCKET     = -3005,     /*!< socket not available for use */
    NSAPI_ERROR_NO_ADDRESS    = -3006,     /*!< IP address is not known */
    NSAPI_ERROR_NO_MEMORY     = -3007,     /*!< memory resource not available */
    NSAPI_ERROR_DNS_FAILURE   = -3008,     /*!< DNS failed to complete successfully */
    NSAPI_ERROR_DHCP_FAILURE  = -3009,     /*!< DHCP failed to complete successfully */
    NSAPI_ERROR_AUTH_FAILURE  = -3010,     /*!< connection to access point failed */
    NSAPI_ERROR_DEVICE_ERROR  = -3011,     /*!< failure interfacing with the network processor */
} nsapi_error_t;