From 1d78f9ddd595ee210db49bbf9760aa3d7ed559a5 Mon Sep 17 00:00:00 2001
From: Andrey Klimov <anklimov@gmail.com>
Date: Sat, 30 May 2020 15:46:17 +0300
Subject: [PATCH] ethernetIdle() weak handler was added in order to execute
 some code while DNS requests and TCP:open/close awaiting for results

---
 src/Dhcp.cpp           | 4 +++-
 src/Dns.cpp            | 6 ++++--
 src/Ethernet.cpp       | 3 +++
 src/EthernetClient.cpp | 3 +++
 4 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/src/Dhcp.cpp b/src/Dhcp.cpp
index 2bfd584b..f5c22597 100644
--- a/src/Dhcp.cpp
+++ b/src/Dhcp.cpp
@@ -5,6 +5,7 @@
 #include "Ethernet.h"
 #include "Dhcp.h"
 #include "utility/w5100.h"
+extern 	void ethernetIdle(void);
 
 int DhcpClass::beginWithDHCP(uint8_t *mac, unsigned long timeout, unsigned long responseTimeout)
 {
@@ -244,7 +245,8 @@ uint8_t DhcpClass::parseDHCPResponse(unsigned long responseTimeout, uint32_t& tr
 		if ((millis() - startTime) > responseTimeout) {
 			return 255;
 		}
-		delay(50);
+		ethernetIdle();
+		delay(1);
 	}
 	// start reading in the packet
 	RIP_MSG_FIXED fixedMsg;
diff --git a/src/Dns.cpp b/src/Dns.cpp
index dfa91125..4f4e4e7a 100644
--- a/src/Dns.cpp
+++ b/src/Dns.cpp
@@ -6,7 +6,7 @@
 #include "Ethernet.h"
 #include "Dns.h"
 #include "utility/w5100.h"
-
+extern 	void ethernetIdle(void);
 
 #define SOCKET_NONE              255
 // Various flags and header field values for a DNS message
@@ -120,6 +120,8 @@ int DNSClient::getHostByName(const char* aHostname, IPAddress& aResult, uint16_t
 					while ((wait_retries < 3) && (ret == TIMED_OUT)) {
 						ret = ProcessResponse(timeout, aResult);
 						wait_retries++;
+						ethernetIdle();
+						delay(1);
 					}
 				}
 			}
@@ -220,7 +222,7 @@ uint16_t DNSClient::ProcessResponse(uint16_t aTimeout, IPAddress& aAddress)
 		if ((millis() - startTime) > aTimeout) {
 			return TIMED_OUT;
 		}
-		delay(50);
+		ethernetIdle();
 	}
 
 	// We've had a reply!
diff --git a/src/Ethernet.cpp b/src/Ethernet.cpp
index 9257090c..f53ca0b4 100644
--- a/src/Ethernet.cpp
+++ b/src/Ethernet.cpp
@@ -244,3 +244,6 @@ void EthernetClass::setRetransmissionCount(uint8_t num)
 
 
 EthernetClass Ethernet;
+
+void ethernetIdle(void) __attribute__ ((weak));
+void ethernetIdle(void) {delay(10);};
\ No newline at end of file
diff --git a/src/EthernetClient.cpp b/src/EthernetClient.cpp
index e2406d7d..407010e9 100644
--- a/src/EthernetClient.cpp
+++ b/src/EthernetClient.cpp
@@ -22,6 +22,7 @@
 #include "Ethernet.h"
 #include "Dns.h"
 #include "utility/w5100.h"
+extern 	void ethernetIdle(void);
 
 int EthernetClient::connect(const char * host, uint16_t port)
 {
@@ -62,6 +63,7 @@ int EthernetClient::connect(IPAddress ip, uint16_t port)
 		if (stat == SnSR::CLOSE_WAIT) return 1;
 		if (stat == SnSR::CLOSED) return 0;
 		if (millis() - start > _timeout) break;
+		ethernetIdle();
 		delay(1);
 	}
 	Ethernet.socketClose(sockindex);
@@ -143,6 +145,7 @@ void EthernetClient::stop()
 			sockindex = MAX_SOCK_NUM;
 			return; // exit the loop
 		}
+		ethernetIdle();
 		delay(1);
 	} while (millis() - start < _timeout);