INDIGO is still under development and INDIGO development guide is under preparation, but in the meantime you can already look at the source codes available in public Git repository.
Make sure that you have all prerequisites installed. On Ubuntu / Debian / Raspian use:
$ sudo apt-get install build-essential autoconf autotools-dev libtool cmake libudev-dev libavahi-compat-libdnssd-dev libusb-1.0-0-dev libcurl4-gnutls-dev libgphoto2-dev libz-dev git curl
It is advised to remove libraw1394-dev as the build may fail if it is installed
$ sudo apt-get remove libraw1394-dev
On macOS install XCode and download and build autoconf, automake and libtool (use tools/cltools.sh script).
If you're ready, get the code and built it
$ git clone https://github.com/indigo-astronomy/indigo.git
$ cd indigo
$ make all
$ build/bin/indigo_server indigo_ccd_asi [other drivers]
and connect from any INDI client or WEB browser to port 7624...
Basics of INDIGO Client Development - A brief client development guide with examples
Basics of INDIGO Driver Development - A brief driver development guide with examples
INDIGO Device Access Control and Exclusive Lock System - A brief driver development guide with examples
Guide to indigo_server and INDIGO Drivers - A brief Guide to indigo_server and INDIGO drivers
INDIGO Property Manipulation in Examples - A brief introduction to indigo_prop_tool
INDIGO Protocols - Description of INDIGO protocols
INDIGO Properties - List of INDIGO properties, their items and mapping to legacy INDI protocol
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Copyright (c) 2020 Rumen G.Bogdanovski
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