01f1e0e9bd
Fix the slope and power values in the Fortius Slope mode Users have complained about incorrect slope and power values for the Fortius. This was due to a few problems. This commit greatly improves the situation with the fixes that solve the following problems: - The Fortius protocol is better documented in the comments. - The pedal sensor is on byte 42, not 46, this prevented the pedal sensor echo to keep the trainer operating normally. - The slope was converted to uint before being scaled, losing the fraction. - The trainer most likely reports the torque. It must be multiplied by the speed to get the power. - The scaling factor for the slope was 2x too high but this did not show earlier because of the pedal sensor problem. - The period for retrieving data was too fast, most packets were empty, the period was changed from 10ms to 50ms (Tacx software uses 100ms). GoldenCheetah is now quite usable on my Fortius with those changes. The slope appears too easy and the power overestimated but this is similar to the behavior of this trainer with the Tacx software. It would be interesting to get feedback from users with powermeters to refine some of the coefficients involved.
GoldenCheetah
About
GoldenCheetah is a desktop application for cyclists and triathletes and coaches, providing a rich set of tools and models to analyse, track and predict performance, optimimise aerodynamics and train indoors.
GoldenCheetah integrates with most popular cloud services like Strava and Todays Plan, imports data from bike computers, imports downloads from any website like TrainingPeaks and Garmin and will also connect to smart trainers using ANT+ and Bluetooth.
GoldenCheetah is free for everyone to use and modify, released under the GPL v2 open source license with pre-built binaries for Mac, Windows and Linux.
Installing
Golden Cheetah install and build instructions are documented for each platform;
INSTALL-WIN32 For building on Microsoft Windows
INSTALL-LINUX For building on Linux
INSTALL-MAC For building on Apple OS X
macOS and Linux: 
Windows:
Official release builds, snapshots and development builds are all available from http://www.goldencheetah.org