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 when it's plugged into the diagnostic socket the fusebox cover can easily be closed, meaning that 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 enough 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 related counters and found the following reduced sequence is all you really need to use
Set port speed to 38400. There's no encryption or security required, it's very straightforward.
(CR & LF required after each)
If you connect with Hyperterminal or Coolterm to your ELM327 interface (wired or bluetooth) and then type in those 6 commands as they are written (the first 5 are required to set up the ELM327 interface, only the last one is a command for the car), then the dpf counters will be reset. This puts off a regen until clogging % reaches 80% or thereabouts, (assuming you have a relieved dpf or bypass pipe) . If you perform the procedure again before clogging % reaches 80% (that equates to roughly 16 hours driving time) you'll reset the counters again and negate any dpf regenerations.
I'm looking to automate this process, so I have another dongle coming for hacking purposes. I probably won't be able to make it dual purpose DPF reset & Bluetooth OBD tool, but I'll try my best. At the worst it will be a dongle which lives in the OBD2 socket taking care of the regen cancelling procedure for me, completely autonomously. If I can keep it as an active bluetooth ELM327 interface too then I'll just be that little bit happier.
I am happy with this as a method for putting off regenerations, so a fully drilled dpf, or a bypass pipe, should be an easier (& cheaper) prospect in future. Should any future legislation require the retrofitting of a complete dpf (either in the Uk or another country) then to reinstate regens you only need to unplug the dongle.
I'll probably put all of this (plus any chip program source code and HEX, probably for a small Microchip PIC uP) in a Yahoogroup for public consumption once it's finalised.