I have a Green Mountain pellet smoker and it has a wifi enabled controller on it.
I know it’s not the same thing as your pellet stove but it has all the same elements. They just do a different process.
Maybe you could copy parts of its functionality into your own design.
At least, it could inspire your design.
The cool thing about 1310nm light is that it will pass down either multimode or single mode fiber.
At that short of a distance, you should be able to use MM 1310nm SFPs.
As long as the SFPs can do the signalling speed needed by the link then I see no reason why it shouldn’t work.