Micro-ros-agent with raspberry pi pico

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You might need to turn hotplug support on to get a serial-port slot from the pico to connect the micro-ros-agent plug to:

Hotplug support

Hotplug support gives snaps the ability to integrate with Linux’s USB hotplugging and Udev device management subsystem. This enables snaps to recognise specific classes of device and create corresponding system slots when a device is connected. Developers wishing to add hotplug functionality to their own interfaces should see Developing hotplug interfaces. Hotplug support is currently under active development, and will become widely available with a future release of snap…