I used to carry an AirCable bluetooth-to-rs232 dongle so I could use my phone as a terminal with random hardware. I wonder where it went... These days I should

I used to carry an AirCable bluetooth-to-rs232 dongle so I could use my phone as a terminal with random hardware. I wonder where it went... These days I should probably just make a new one, plus a TTL-voltage version since that's what I encounter more often anymore. Heck, maybe a current-loop version too, in case I drop in on my minicomputer-and-telephone-switch friends...