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The heartbeat of the firmware might be used for multiple purposes. It
can trigger a blinking LED on the PCB, can be displayed in a client
program or might serve additional purposes.
Since at least display in client programs should be implemented and
multiple clients should be support in long term it improves the code
structure to use a zbus channel here to publish heartbeat messages in a
publish-subscribe pattern.
That way the publishing of the heartbeat message and the receiving by an
unknown number of observers is completely decoupled. A central trait of
the publish-subscribe pattern and an advantage for a modular code
structure.
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Common browsers always request this URL. Not responding to it shows up
as an error.
To silence this error report the firmware just responds with HTTP 204 No
Content since a favicon is currently not available.
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This provides the index HTML page.
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This follows the pattern:
* ERR in error handler if statements
* DBG at top of each function and on demand
* INF at end of function
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The used MAC address is from an example range. Later it can easily be
combined with reading from a MAC-providing EEPROM chip to using a unique
hardware MAC on the device.
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Network-based logging via the syslog protocol allows to log from many
IoT devices to a central log server.
This makes reading logs way easier. Choosing UDP removes the need for
logic keeping a state. Maybe dropped packages are acceptable for the use
case but should be rare anyway.
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This makes it easier to develop the whole network-related firmware parts
on a simulation board instead of hardware.
The nucleo_f767zi board has likely a hardware bug making Ethernet
sometimes fail. This is not suitable for development.
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The Mozilla Public License seems to be suitable for this firmware
project. See the original license text for details.
This commit also adds a `.txt` suffix to the LICENSE file to make the
file type more visible to humans and tools.
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This makes the name shorter which is especially relevant for Git commit
messages.
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