Have to start computer before any other WiFi gadget

Hi,

I would like any advice to the following issue:

I have to start my computer (MBP), before any other WiFi electronics for they to find network. For instance, if I want to print a document I only have to options:

A) I turn On my printer (Canon MG5250), at the beginning of the day and let it On or...

B) I have to restart my MBP with the printer already On for it to print.

The same happens with my Smart TV (Samsung). It won't find the PLEX server if I start my TV after my computer.

I have all three (MBP, TV and Printer), connected to the same Home network, everything wireless (MBP included).

Any assistance appreciated. Thanks.