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It is possible to not use the default DNS configuration when resolving a specific host such as specifying a particular DNS server, different number of request retry retries and so on. When calling DNSc_GetHost() it is possible to specify a request configuration in the parameter p_cfg. 

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Request Configuration

µC/DNS use uses the following structure to configure requestrequests:

typedef  struct  DNSc_req_cfg {
    DNSc_ADDR_OBJ  *ServerAddrPtr;
    NET_PORT_NBR    ServerPort;
    CPU_INT16U      TaskDly_ms;
    CPU_INT16U      ReqTimeout_ms;
    CPU_INT08U      ReqRetry;
    DNSc_REQ_TYPE   ReqType;
    DNSc_FLAGS      ReqFlags;
} DNSc_REQ_CFG;

Structure Fields

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Structure Field	Type	Description	Possible Values
ServerAddrPtr	CPU_CHAR	Server IP address	DEF_NULL to use the default server Pointer to a string that contains the IP address.
ServerPort	NET_PORT_NBR	Port number	NET_PORT_NBR_NONE Default DNS port MUST be >= NET_PORT_NBR_MIN Must be <= NET_PORT_NBR_MAX
TaskDly_ms	CPU_INT16U	Configure task delay in integer milliseconds	Default value: [DNSc_DFLT_TASK_DLY_MS] = 50ms MUST be >= 1
ReqTimeout_ms	CPU_INT16U	Configure timeout before a request resolution retry	Default value: [DNSc_DFLT_REQ_RETRY_TIMEOUT_MS] = 1000ms MUST be >= 100
ReqRetry	CPU_INT08U	Configure maximum of request resolution retry.	Default value: [DNSc_DFLT_REQ_RETRY_NBR_MAX] = 2  MUST be >= 1
ReqType	DNSc_REQ_TYPE	Instructs the DNS request state machine if the request is a forward request (type A, AAAA), or a reverse request (type PTR IPv4 or PTR IPv6).	Meant for internal use by uC/DNSc. Any values passed are ignored.
ReqFlags	DNSc_FLAGS	Contains a copy of DNSc_GetHost()'s 'flags' argument to keep track of them internally. Enables DNSc to use its internal flags DNSc_FLAG_UPDATE_PREF and DNSc_FLAG_RESET_REQ without modifying the 'flags' argument.	Meant for internal use by uC/DNSc. Any values passed are ignored.