rctest(1) on Linux
The text 3809e869167a, as Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze) shipped it.
RFCOMM testing
Flags it lists
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-A -
-B -
-C -
-D -
-E -
-L -
-M -
-N -
-P -
-S -
-T -
-U -
-W -
-b -
-i