This library is stable and by now pretty much in bugfix-only mode. The reason for that is that the support for Unified Diagnostic Services (UDS) (which I originally planned to implement in this library) proved to be unworkable – see this comment for more details.

If your priority is full OBD2 coverage, you can (and should) still continue to use this library. It works great with both Objective-C and Swift (in particular the SPM branch). If your priority is UDS though, I might have something proprietary for you. If you aren't shy of licensing a closed source library, please contact me in private.

LTSupportAutomotive is a library for writing apps that communicate with vehicles using OBD2 adapters. It also contains auxilliary classes, such as a VIN decoder, and a BTLE characteristic(s) / NSStream serial bridge.

Here is an overview of the most important classes:

Represents an OBD2 adapter sending commands over input- and output-streams using a certain vehicle protocol. Concrete subclasses (e.g., LBOBD2AdapterELM327 for ELM327-compatible chipsets, or LTOBD2AdapterCaptureFile for capture files) are available.

Represents an OBD2 command. Concrete subclasses, e.g. for the well-known OBD2 PIDs are available.

Represents a generic vehicle protocol. Concrete subclasses for protocols such as ISO14230-4 (CAN), ISO15765-4, ISO9141-2, or SAEJ1850 are available.

Represents a bridge between one or two BTLE characteristics and NSStream subclasses.

Add this framework to your podfile:

pod 'LTSupportAutomotive', '~> 1.0'

If anyone wants to make this carthage aware, feel free to supply a pull request. I'm not using this package manager myself.

You can also include LTSupportAutomotive as an Xcode subproject and link LTSupportAutomotive.framework to your executable.

Please see the SPM branch.

LTAutomotiveSupportDemo.xcodeproj is a (pretty bare-bones) example project.

• OBD2 Expert (yours truly)
• Cargo Objects Street Assistant (LAWA-Solutions GmbH)

Please drop us a note, if you are using this library as well.

This software should work with most ELM327-compatible hardware (including the behemoth of available clones). In general, I recommend the Bluetooth 4.0 devices, since they seem to have a much better quality compared to WiFi adapters – and these days they are only minimally more expensive. Moreover, they're much more convenient as you don't have to switch the WiFi network (potentially losing your internet connectivity).

Note that since iOS is lacking public SDK access to Bluetooth classic (in particular the Bluetooth rfcomm protocol), iOS devices will generally not work with Bluetooth 3.0 adapters – notable exceptions being those who take part in the Apple Manufactured For iPod program.

I have tested this library myself with the following adapters (Note that none of these contain a real ELM327):

• SCANTOOL OBDLINK MX+ (STN2255)

• Carista Bluetooth OBD2
• FIXD OBD-II Scan Tool (2nd Gen)
• kungfuren OBD2 Bluetooth 4.0
• LELink Bluetooth Low Energy
• VGate iCar Pro BLE4.0 Dual
• WGSoft.de UniCarScan UCSI-2000
• WGSoft.de UniCarScan UCSI-2100

• EXZA® SUPER Mini WiFi WLAN OBD 2
• NAVISKAUTO WIFI WLAN ELM327
• SCANTOOL OBDLINK MX WIFI (STN1153)

• SCANTOOL OBDLINK SX (STN1130)
• SCANTOOL OBDLINK EX (STN2230)

While this library can already be used for a lot of things, I'd like to see improvements in a bunch of areas, such as:

• Translations (I only have DE, FR, and EN atm.),
• Implementation of missing standardized PIDs,
• Addition of vendor-specific DTCs,
• Implementation of vendor-specific PIDs,
• Implementation of direct (non-PID-based) communication with ECUs.

Please fork and open a pull-request. I'd also like to know about success stories or confirmation for additional compatible hardware (see above) working with this library.

• LAWA Solutions GmbH
• Thomas Dankert
• BOSCH Service Solutions GmbH
• TPE Europe GmbH

Copyright (c) 2016-2021 Dr. Michael 'Mickey' Lauer

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