[obdgpslogger] Problem with perl Device::ELM327 and obdsim

Jason McCarver slam at parasite.cc
Tue May 27 16:44:08 EDT 2014

Sorry for the extra email ... I forgot to change the subject on my
initial email!


I've been attempting to use the perl Device::ELM327 module with
obdsim.  I've run into a problem :)  The module turns headers on (ATH1)
and sets the protocol to automatic.  When it sends any non-AT command
to the ECU it is expecting headers to be present but because the
protocol mode is automatic, obdsim doesn't generate any headers (see
render_obdheader() in src/sim/mainloop.cc). 

When I use the perl module with a physical ELM327 device, there are
headers present like the module expects. I'm not sure what the fix here
is, I hacked obdsim to generate headers as if it were protocol
J1850PWM.  I'm sure this is the wrong way to go about it but that did
get it working with Device::ELM327. 

Any ideas?  Am I missing something obvious here (I wouldn't be


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