A quick way to get Shortwave running with Factorio 1.1:

1) Update info.json so that the mod will run on Factorio 1.1:

"factorio_version": "1.1",

2) With Factorio 1.1.0, we've got more collision masks, and some of the old ones have new names. In data.lua, change line 126:

collision_mask = { "layer-11" }, -- OLD
collision_mask = { "rail-layer" }, -- NEW

This will let you load the game up to the main menu. There may be other things that will break in the control stage (during a game session), but I haven't got a crash yet. Then again, I didn't do much testing yet. :-)

Not crashing, but it won't let me place working units. Existing units will still work, but newly placed units don't seem to have all the parts (specifically shortwave-port if I'm following the code and descriptions correctly.)

Something in Factorio 1.1.x has glitched the placement of the I/O port entity. Blueprinting shows both components are still there, but the slightly offset selection box I was using for the I/O port (a decider combinator) doesn't seem to work anymore. Need to go through the game change logs.

Ghost placement from the cursor (Shift+Left Click) still has issues so it might not be the ultimate solution, but normal placement, blueprints, and copy & paste all seem to work now...

To get the I/O port to show up on a new entity, remark out or delete line 98 in control.lua

port.direction = defines.direction.south

becomes

--port.direction = defines.direction.south

I uploaded a version with all the issues fixed. This will behave correctly when you place ghosts, pipette I/O ports, or use scripts to build, revive, or clone them.

https://mods.factorio.com/mod/shortwave_fix

Edit: Might have issues migrating, make sure to keep a backup!