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So basically, I just tried the same PWM control for the servo but on the ESC. Have a look at this gits:

https://gitlab.com/bradanlane/ros-i2cpwmboard (works fine with my ESC)
https://github.com/liamondrop/ros-pca9685-board (this one needs WiringPi, couldn't make it work)

My ESC works in a very narrow range (340 on the pwm value means no speed, and 350 means top speed more or less).

I am going to try the proportional control offered in the first git.

Regards.

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