obdsim - Online in the Cloud

PROGRAM:

NAME

obdsim - Simulate an ELM327 device

SYNOPSIS

obdsim [ options ]

DESCRIPTION

obdsim simulates an ELM327 device connected to one or more ECUs

OPTIONS

-g|--generator <generator-name>
Choose a generator. A list of valid ones is output by --help. See section titled
MULTIPLE ECUS below for more information.

-s|--seed <seed>
Generator-specific seed. See section titled PLUGIN SEEDS below for more
information. The -s option must immediately follow the generator

-d|--customdelay <delay-in-ms>
Generator-specific delay. This is effectively a processing time for the ECU it is
being added for. The -d option must immediately follow the generator

-l|--list-generators
Print a terse list of compiled in generators

-L|--list-protocols
Print a list of all protocols

-p|--protocol <OBDII protocol>
Launch as this protocol. Protocol is of form [A]{digit}, where optional "A" prefix
means automatic and the digit is from --list-protocols

-n|--benchmark <time>
Change time to print samplerate to stdout. 'samples' are successful value returns,
not AT commands or NO DATA/? responses. 'queries' are any and all client queries.
Argument is in seconds, zero to disable.

-q|--logfile <logfile>
Write all serial comms to this logfile

-o|--launch-logger
Takes an [admittedly weak and hard-coded] attempt at launching obdgpslogger
attached to the simulator in question. POSIX only.

-c|--launch-screen
Takes an [admittedly weak and hard-coded] attempt at launching screen attached to
the simulator in question. To close that screen window, use ctrl-a, k. POSIX only.

-t|--tty-device
Instead of opening a pty, try to open this entry in /dev instead. POSIX only.

-w|--com-port <comport>
Specify virtual com port to be used on windows [eg "COM1"]. Windows only.

-e|--genhelp <generator-name>
Print out help for the specified generator, and exit.

-V|--elm-version <version string>
Pretend to be this when someone resets with ATZ or similar

-D|--elm-device <device string>
Pretend to be this when someone calls AT@1

-b|--bluetooth
Listen on bluetooth. See section titled BLUETOOTH below

-v|--version
Print out version number and exit.

-h|--help
Print out help and exit.

PLUGIN SEEDS

Each plugin takes a seed. Here's what those seeds are:

Random [Optional] It's a random seed

Cycle [Optional] [cycle time in seconds[,number of gears]]

Logger [Obligatory] Filename of an obdgpslogger logfile

dlopen [Obligatory] Filename of a dynamically linked library
[Optional] ",subseed" optional seed to pass to dlopen'd generator.

Socket [Obligatory] ip-or-hostname:port

DBus [Obligatory] Filename of a configuration file for the plugin

gui_fltk
[Irrelevant] Ignores the passed seed

Error [Irrelevant] Ignores the passed seed

MULTIPLE ECUS

OBDSim supports multiple simulated engine control units (ECUs).

For each generator you specify on the command-line, it creates an ECU. To seed each
generator, the seed must immediately follow that generator on the command-line.

For example, this creates a sim with three ecus. The first ecu is simulating the passed
logfile, the second is generating random numbers with the seed 42, and the gui generator
isn't using a seed.

obdsim -g Logger -s ces2010.db -g Random -s 42 -g gui_fltk

SUPPORTED AT COMMANDS

OBDSim does not yet support the full set of ELM327 commands. The ELM327 datasheet covers
all these in detail, but a short description of each AT command currently supported by
obdsim is here:

AT{0,1,2}
Adaptive timing off/on/vigorous

D{0,1} Display DLC [data bytes] on/off

L{0,1} Linefeed on/off [always passes a CR]

H{0,1} Headers on/off

S{0,1} Space separators on/off

E{0,1} Command echo on/off

SP[A]{0-9,A-C}
Set protocol. Optional 'A' prefix on number means "automatic"

TP[A]{0-9,A-C}
Try protocol. Same behaviour as SP[a]{0-9,A-C}. Always succeeds if protocol is
known

ST{n} Set timeout. Hex value is multiplied by 4, and measured in ms

@1 Request the elm device description

@2 Request the elm device identifier

@3 Set the elm device identifier

CVdddd Calibrate the current battery voltage to dd.dd

RV Request the current battery voltage

D Reset to defaults

DP Describe protocol

DPN Describe protocol by number

I Request the device version id

Z Reset the device

WS Reset the device, warm start

EXIT Not really an AT command; sending this tells obdsim to exit. Mostly useful in
conjunction with --launch-screen

BLUETOOTH

At time of writing, bluetooth is only supported on Linux. In order to make bluetooth work,
you may need to set your bluetooth device to advertise that it's capable of the
appropriate serial protocols.

On my system here, I use the following two commands to set it temporarily [you'll want to
substitute your own hardware address]:

sudo rfcomm bind 0 00:02:72:14:41:C4 1
sudo sdptool add SP

NOTES

The default sim ELM version and device both claim to be OBDGPSLogger. Some software may
not like this. You may find examples of popular hardware to be useful:

OBDPro
obdsim -V ELM327\ v1.3\ compatible -D OBDPros\ LLC\ v3

OBDLink
obdsim -V ELM327\ v1.3a -D SCANTOOL.NET\ LLC

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