I have not, yet. But I would definitely consider making one. It's a very interesting tool, particularly for those with less reliable internet connections.
Think of it as turning phones into relays that store notes but also share them with other nearby phones via bluetooth.
You can find here a quick example: nostr:nevent1qqsr5cztcmq5mvksz03vz4p5w22jvn8xc3g90w835rxdt0d5gcf52egpr4mhxue69uhkummnw3ezucnfw33k76twv4ezuum0vd5kzmp0qgsqm9a74et8lnkfcet578rw7cfxa2tf6jvjcvvcu5wqltzjc5n559qrqsqqqqqphnk3mf
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So at a conference I could be posting on Nostr via bluetooth. Maybe next year bitcoin Prague?
You can start testing it out now 😄