Cables are never included in NUCLEO and DISCOVERY kits because this increases costs and, above all, the amount of waste.
- A Micro-AB socket accepts both Micro-A and Micro-B plugs and can therefore be used for USB OTG (device or host).
- A Micro-B socket only accepts Micro-B plugs only and can therefore only be used as a USB device.
Details can be seen in the photos on Wikipedia, for example.
Hope that helps?
Regards
/Peter
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