Add support for DHCP hostname #921
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The compiler errors arise from the fact that a call to Ethernet.begin(nullptr) is ambiguous now: /home/runner/work/ArduinoCore-mbed/ArduinoCore-mbed/libraries/Ethernet/examples/UdpNtpClient/UdpNtpClient.ino:143:29: error: call of overloaded 'begin(std::nullptr_t)' is ambiguous
if (Ethernet.begin(nullptr) == 0) {
^
In file included from /home/runner/.arduino15/packages/arduino/hardware/mbed/3.3.0/libraries/Ethernet/src/PortentaEthernet.h:3:0,
from /home/runner/work/ArduinoCore-mbed/ArduinoCore-mbed/libraries/Ethernet/examples/UdpNtpClient/UdpNtpClient.ino:22:
/home/runner/.arduino15/packages/arduino/hardware/mbed/3.3.0/libraries/Ethernet/src/Ethernet.h:65:7: note: candidate: int arduino::EthernetClass::begin(uint8_t*, long unsigned int, long unsigned int)
int begin(uint8_t *mac = nullptr, unsigned long timeout = 60000, unsigned long responseTimeout = 4000);
^~~~~
/home/runner/.arduino15/packages/arduino/hardware/mbed/3.3.0/libraries/Ethernet/src/Ethernet.h:66:7: note: candidate: int arduino::EthernetClass::begin(const char*)
int begin(const char* hostname);
^~~~~I suppose to make sure no code is broken the If someone has a more elegant solution please let me know. |
…t char* hostname) method.
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Hi @Channel59 thank you so much for your contribution! |
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Recently someone pointed me to this PR on the mbed-os repo: ARMmbed/mbed-os#15506.
The patches to make these changes are included in this pull request and so the credits for these patches full go to https://github.com/guilhermerc.
It enables the use of a hostname when DHCP is used to obtain an IP address.
Subsequently, the Ethernet.cpp and Ethernet.h are adjusted to allow the hostname to be set:
Either usingEthernet.begin("desired-hostname");or using a somewhat more Arduino-like api:
Ethernet.setHostname("desired-hostname"); Ethernet.begin();Before this compiles,
libmbed.ashould be recompiled on https://github.com/ARMmbed/mbed-os/tree/latest which will also patch some of the header files that are required to compile the arduino program.The code seems to work correctly with the opta. Any testing / refinements are more than welcome.
I do not have a wifi enabled device, so I cannot test it, but with these patches applied, a small change to Wifi.h and Wifi.cpp could add support for Wifi as well.