Hostname Setting

[TheGuyDanish]

Currently, setting network.hostname() does not actually set a hostname that gets picked up in DHCP. I have not done a packet dump to investigate why, but I assume the WIZNET5K driver used in MicroPython ignores the setting when sending DHCP requests. Other MicroPython implementations of the W5500 exists where DHCP is handled outside of the built-in driver, likely fixing the issue, but developing an entire W5500 driver just for DHCP hostnames seems a bit extreme.

It doesn't seem like there's a register in the W5500 that stores a hostname, so any use of the hostname would have to be done in software, likely requiring the efforts like in the above example.

[TheGuyDanish]

I did some testing on the different implementation and while it works, it doesn't use the Pico Unique ID function to generate a MAC. This can be replicated though. The bigger issue is that asyncio (used by Microdot) uses the built-in socket library, where this custom implementation provides its own socket.

[DaveCorder]

I don't know if you're still interested in this issue now that the C version is pretty much ready, but I stumbled on something today...

Try changing this, so the hostname is set first:

def w5500_init(spi):
    nic = network.WIZNET5K(spi, Pin(5), Pin(0))  # Bus, CSn, RSTn
    # Setting the hostname currently does nothing.
    # See https://github.com/OpenJBOD/software/issues/2
    network.hostname(CONFIG["network"]["hostname"])

to:

def w5500_init(spi):
    network.hostname(CONFIG["network"]["hostname"])
    nic = network.WIZNET5K(spi, Pin(5), Pin(0))  # Bus, CSn, RSTn

The MicroPython docs say "... you must set the hostname before activating/connecting your network interfaces."

This did the trick for me in another project (that's based on this one), however I am using a different microcontroller and Ethernet device, so not sure it applies here. Maybe worth trying.