Configurable timeout in DNS getHostByName()

Author: PaulStoffregen

src/Dns.cpp

@@ -85,7 +85,7 @@ int DNSClient::inet_aton(const char* address, IPAddress& result)
 	return 1;
 }
 
-int DNSClient::getHostByName(const char* aHostname, IPAddress& aResult)
+int DNSClient::getHostByName(const char* aHostname, IPAddress& aResult, uint16_t timeout)
 {
 	int ret = 0;
 
@@ -118,7 +118,7 @@ int DNSClient::getHostByName(const char* aHostname, IPAddress& aResult)
 					int wait_retries = 0;
 					ret = TIMED_OUT;
 					while ((wait_retries < 3) && (ret == TIMED_OUT)) {
-						ret = ProcessResponse(5000, aResult);
+						ret = ProcessResponse(timeout, aResult);
 						wait_retries++;
 					}
 				}

src/Dns.h

@@ -26,7 +26,7 @@ class DNSClient
 	    @result 1 if aIPAddrString was successfully converted to an IP address,
 	            else error code
 	*/
-	int getHostByName(const char* aHostname, IPAddress& aResult);
+	int getHostByName(const char* aHostname, IPAddress& aResult, uint16_t timeout=5000);
 
 protected:
 	uint16_t BuildRequest(const char* aName);