I have a CAN bus with one node acting as a master and several slaves. All nodes have a independent power supply. Is it possible to switch all nodes off and on from the master? The switch off can be realized over a CAN-message. But is there a way to power on Nodes over the CAN bus? It would be okay to switch all slave nodes on by powering up the bus and switching all off by commands to switch them all on again later.
Instead of switch on or off a node, Sleep function of the node MCU can be an option. If you send a specific message from master then the receiver can put itself into Sleep mode. Then if you send another message, it can wake up. But this requires a detailed programming.