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Fix: Clear W5100 IP address on DHCP lease failure #293

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Fix: Clear W5100 IP address on DHCP lease failure #293

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@kaabia kaabia commented Nov 9, 2025

This addresses the issue where the device retains a stale, invalid IP address after DHCP lease renewal fails (DHCP_CHECK_RENEW_FAIL or DHCP_CHECK_REBIND_FAIL), which could cause network conflicts or connection issues. The fix sets the IP to 0.0.0.0.

@kaabia
Fix: Clear W5100 IP address on DHCP lease failure
6406e0d 
This addresses the issue where the device retains a stale, invalid IP
address after DHCP lease renewal fails (DHCP_CHECK_RENEW_FAIL or
DHCP_CHECK_REBIND_FAIL), which could cause network conflicts or
connection issues. The fix sets the IP to 0.0.0.0.

Signed-off-by: Badr Bacem KAABIA <badrbacemkaabia@gmail.com>
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github-actions bot commented Nov 9, 2025

Memory usage change @ 6406e0d

Board flash % RAM for global variables %
arduino:avr:leonardo 🔺 0 - +62 0.0 - +0.22 0 - 0 0.0 - 0.0
arduino:avr:mega 🔺 0 - +74 0.0 - +0.03 0 - 0 0.0 - 0.0
arduino:avr:nano 🔺 0 - +62 0.0 - +0.2 0 - 0 0.0 - 0.0
arduino:megaavr:nona4809 🔺 0 - +112 0.0 - +0.23 0 - 0 0.0 - 0.0
arduino:megaavr:uno2018 🔺 0 - +112 0.0 - +0.23 0 - 0 0.0 - 0.0
arduino:sam:arduino_due_x_dbg 🔺 0 - +64 0.0 - +0.01 N/A N/A
arduino:samd:arduino_zero_edbg 🔺 0 - +60 0.0 - +0.02 0 - 0 0.0 - 0.0
arduino:samd:mkr1000 🔺 0 - +60 0.0 - +0.02 0 - 0 0.0 - 0.0
arduino:samd:mkrfox1200 🔺 0 - +60 0.0 - +0.02 0 - 0 0.0 - 0.0
arduino:samd:mkrgsm1400 🔺 0 - +60 0.0 - +0.02 0 - 0 0.0 - 0.0
arduino:samd:mkrnb1500 🔺 0 - +60 0.0 - +0.02 0 - 0 0.0 - 0.0
arduino:samd:mkrvidor4000 🔺 0 - +60 0.0 - +0.02 0 - 0 0.0 - 0.0
arduino:samd:mkrwan1300 🔺 0 - +60 0.0 - +0.02 0 - 0 0.0 - 0.0
arduino:samd:mkrwan1310 🔺 0 - +60 0.0 - +0.02 0 - 0 0.0 - 0.0
arduino:samd:mkrwifi1010 🔺 0 - +60 0.0 - +0.02 0 - 0 0.0 - 0.0
arduino:samd:mkrzero 🔺 0 - +60 0.0 - +0.02 0 - 0 0.0 - 0.0
arduino:samd:nano_33_iot 🔺 0 - +60 0.0 - +0.02 0 - 0 0.0 - 0.0
Click for full report table
Board examples/AdvancedChatServer
flash		 % examples/AdvancedChatServer
RAM for global variables		 % examples/BarometricPressureWebServer
flash		 % examples/BarometricPressureWebServer
RAM for global variables		 % examples/ChatServer
flash		 % examples/ChatServer
RAM for global variables		 % examples/DhcpAddressPrinter
flash		 % examples/DhcpAddressPrinter
RAM for global variables		 % examples/DhcpChatServer
flash		 % examples/DhcpChatServer
RAM for global variables		 % examples/LinkStatus
flash		 % examples/LinkStatus
RAM for global variables		 % examples/PagerServer
flash		 % examples/PagerServer
RAM for global variables		 % examples/TelnetClient
flash		 % examples/TelnetClient
RAM for global variables		 % examples/UDPSendReceiveString
flash		 % examples/UDPSendReceiveString
RAM for global variables		 % examples/UdpNtpClient
flash		 % examples/UdpNtpClient
RAM for global variables		 % examples/WebClient
flash		 % examples/WebClient
RAM for global variables		 % examples/WebClientRepeating
flash		 % examples/WebClientRepeating
RAM for global variables		 % examples/WebServer
flash		 % examples/WebServer
RAM for global variables		 %
arduino:avr:leonardo 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 40 0.14 0 0.0 62 0.22 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 56 0.2 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0
arduino:avr:mega 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 74 0.03 0 0.0 70 0.03 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 56 0.02 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0
arduino:avr:nano 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 40 0.13 0 0.0 62 0.2 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 56 0.18 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0
arduino:megaavr:nona4809 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 106 0.22 0 0.0 82 0.17 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 112 0.23 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0
arduino:megaavr:uno2018 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 106 0.22 0 0.0 82 0.17 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 112 0.23 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0
arduino:sam:arduino_due_x_dbg 0 0.0 N/A N/A 0 0.0 N/A N/A 0 0.0 N/A N/A 56 0.01 N/A N/A 64 0.01 N/A N/A 0 0.0 N/A N/A 0 0.0 N/A N/A 0 0.0 N/A N/A 0 0.0 N/A N/A 64 0.01 N/A N/A 0 0.0 N/A N/A 0 0.0 N/A N/A 0 0.0 N/A N/A
arduino:samd:arduino_zero_edbg 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 60 0.02 0 0.0 60 0.02 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 60 0.02 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0
arduino:samd:mkr1000 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 60 0.02 0 0.0 60 0.02 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 60 0.02 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0
arduino:samd:mkrfox1200 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 60 0.02 0 0.0 60 0.02 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 60 0.02 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0
arduino:samd:mkrgsm1400 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 60 0.02 0 0.0 60 0.02 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 60 0.02 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0
arduino:samd:mkrnb1500 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 60 0.02 0 0.0 60 0.02 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 60 0.02 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0
arduino:samd:mkrvidor4000 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 60 0.02 0 0.0 60 0.02 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 60 0.02 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0
arduino:samd:mkrwan1300 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 60 0.02 0 0.0 60 0.02 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 60 0.02 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0
arduino:samd:mkrwan1310 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 60 0.02 0 0.0 60 0.02 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 60 0.02 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0
arduino:samd:mkrwifi1010 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 60 0.02 0 0.0 60 0.02 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 60 0.02 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0
arduino:samd:mkrzero 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 60 0.02 0 0.0 60 0.02 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 60 0.02 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0
arduino:samd:nano_33_iot 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 60 0.02 0 0.0 60 0.02 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 60 0.02 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0
Click for full report CSV 
Board,examples/AdvancedChatServer<br>flash,%,examples/AdvancedChatServer<br>RAM for global variables,%,examples/BarometricPressureWebServer<br>flash,%,examples/BarometricPressureWebServer<br>RAM for global variables,%,examples/ChatServer<br>flash,%,examples/ChatServer<br>RAM for global variables,%,examples/DhcpAddressPrinter<br>flash,%,examples/DhcpAddressPrinter<br>RAM for global variables,%,examples/DhcpChatServer<br>flash,%,examples/DhcpChatServer<br>RAM for global variables,%,examples/LinkStatus<br>flash,%,examples/LinkStatus<br>RAM for global variables,%,examples/PagerServer<br>flash,%,examples/PagerServer<br>RAM for global variables,%,examples/TelnetClient<br>flash,%,examples/TelnetClient<br>RAM for global variables,%,examples/UDPSendReceiveString<br>flash,%,examples/UDPSendReceiveString<br>RAM for global variables,%,examples/UdpNtpClient<br>flash,%,examples/UdpNtpClient<br>RAM for global variables,%,examples/WebClient<br>flash,%,examples/WebClient<br>RAM for global variables,%,examples/WebClientRepeating<br>flash,%,examples/WebClientRepeating<br>RAM for global variables,%,examples/WebServer<br>flash,%,examples/WebServer<br>RAM for global variables,%
arduino:avr:leonardo,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,40,0.14,0,0.0,62,0.22,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,56,0.2,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0
arduino:avr:mega,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,74,0.03,0,0.0,70,0.03,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,56,0.02,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0
arduino:avr:nano,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,40,0.13,0,0.0,62,0.2,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,56,0.18,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0
arduino:megaavr:nona4809,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,106,0.22,0,0.0,82,0.17,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,112,0.23,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0
arduino:megaavr:uno2018,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,106,0.22,0,0.0,82,0.17,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,112,0.23,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0
arduino:sam:arduino_due_x_dbg,0,0.0,N/A,N/A,0,0.0,N/A,N/A,0,0.0,N/A,N/A,56,0.01,N/A,N/A,64,0.01,N/A,N/A,0,0.0,N/A,N/A,0,0.0,N/A,N/A,0,0.0,N/A,N/A,0,0.0,N/A,N/A,64,0.01,N/A,N/A,0,0.0,N/A,N/A,0,0.0,N/A,N/A,0,0.0,N/A,N/A
arduino:samd:arduino_zero_edbg,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,60,0.02,0,0.0,60,0.02,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,60,0.02,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0
arduino:samd:mkr1000,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,60,0.02,0,0.0,60,0.02,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,60,0.02,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0
arduino:samd:mkrfox1200,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,60,0.02,0,0.0,60,0.02,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,60,0.02,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0
arduino:samd:mkrgsm1400,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,60,0.02,0,0.0,60,0.02,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,60,0.02,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0
arduino:samd:mkrnb1500,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,60,0.02,0,0.0,60,0.02,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,60,0.02,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0
arduino:samd:mkrvidor4000,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,60,0.02,0,0.0,60,0.02,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,60,0.02,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0
arduino:samd:mkrwan1300,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,60,0.02,0,0.0,60,0.02,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,60,0.02,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0
arduino:samd:mkrwan1310,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,60,0.02,0,0.0,60,0.02,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,60,0.02,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0
arduino:samd:mkrwifi1010,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,60,0.02,0,0.0,60,0.02,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,60,0.02,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0
arduino:samd:mkrzero,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,60,0.02,0,0.0,60,0.02,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,60,0.02,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0
arduino:samd:nano_33_iot,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,60,0.02,0,0.0,60,0.02,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,60,0.02,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0

@per1234 per1234 added topic: code Related to content of the project itself type: imperfection Perceived defect in any part of project labels Nov 12, 2025
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@kaabia @per1234