Working for over a year, we’ve been making slow but steady progress on changing the way how we fundamentally talk to the dongle. The cheap Chinese dongles are awful coping with what we call “Free Frames”, and especially the torque bars make extensive use of those. Reliability is low, delay is high and many dongles won’t work at all. Finally, since the ZE40 models came along, many dongles were overwhelmed by the busier traffic on that type’s CANbus.
We’re getting close to releasing a version of CanZE that tackles all of the above. The downside will be that we will need to drop a few fields but we regard then as rather unessential. Think of indications like cabin temperature set-point, flap open; things that are clearly visible on the dashboard anyway.
For the technically minded readers: if approved, the next version will have an alternate mode that will use only ISOTP request-response type of communications. Next to loosing mentioned fields, a ISOTP is by definition somewhat intrusive to the car compared to free frame “sniffing”. This is academical though.
We will encourage all users using and ELM327 type of dongle, such as the KONNWEI902, to try switching on “Use ISOTP fields” in the settings; things might improve significantly. For those who have build or want to build an CanSee dongle, we suggest to keep using free frames. It will beat the ELM dongles in speed hands down. After feedback, we might automate the switch based on dongle type.
Stay tuned, all coding is done and we’re now testing.
Edit: As silly cheap dongles sometimes have no secure Bluetooth capabilities, CanZE switches to an insecure Bluetooth connection when “Use ISOTP fields” mode is switched on.