Gene,
Yes, the if I controle the GPIO in the PI 192.168.1.6 directly it's work properly, yes, the state change on the master PI.
In the modules list of the slave PI (192.168.1.6), Routing label for all GPIO are Empty. Which value we have to put there if any ?
In the modules list of the master PI (localhost), Routing label for the HGIC:192_168_1_6.RaspberryPI.Gpio.GPIO9 has this value : "192.168.1.6:80"
Dani