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This makes the KiCad project a valid PCB as a minimal starting point.
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Based on UM2592 the development kit Nucleo WL55JC which is used for
firmware development is based on the STM32WL55JCI7 microcontroller.
Thus this MCU should be a good starting point for now.
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The shell prompt was changed from the default 'uart:~$ ' to
'[iot-contact] ' so that it is more visible which kind of firmware is
running on the device.
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This is enough to validate that the firmware is running by using the
integrated Zephyr shell.
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