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    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;


    Posted by 커피를 즐기는 개발자~~ wiznxt