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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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8 changes: 8 additions & 0 deletions src/Ethernet.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -135,6 +135,14 @@ int EthernetClass::maintain()
SPI.endTransaction();
_dnsServerAddress = _dhcp->getDnsServerIp();
break;
case DHCP_CHECK_RENEW_FAIL:
case DHCP_CHECK_REBIND_FAIL:
// Lease renewal failed; IP is no longer valid.
// Stop using the IP address to avoid conflicts.
SPI.beginTransaction(SPI_ETHERNET_SETTINGS);
W5100.setIPAddress(IPAddress(0,0,0,0).raw_address());
SPI.endTransaction();
break;
default:
//this is actually an error, it will retry though
break;
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