A bluetooth OBD2 dongle arrived today, cost me £7.50 in total, bummer
First test was to see how much current it drew, because it's so small and dinky that it fits in the socket and the cover can easily be closed, meaning it can be left in place forever.
2 minutes after turning the car off and removing the keys the total battery drain was around 100mA. Pretty good, it means there's a total loss of (upto) 3Ah per day from the battery. If I had tested it after 10 minutes it might have settled to a lower figure, but I was happy enoguh with 100mA. I might consider unplugging it if I'm leaving the car for a few weeks, but otherwise it can stay in place. It reports itself as latest v1.5a, which is often touted as the 'low sleep power' version
The upshot is I can reset my dpf counters while making a cup of tea in the kitchen. I haven't managed to connect using my phone yet though, and AlfaOBD doesn't recognise com port 20 (which it installs as on my PC) but MultiECUScan picks it up no problem.
I've tinkered with the commands to reset the dpf and found the following reduced sequence is all yoiiu really need
(CR & LF required after each)
If you connect with Hyperterminal or Coolterm to your ELM327 interface (wired or bluetooth) and then type in those commands as they are written, then the dpf counters will be reset.