running (from IEx) `Network.setup` doesn't seem set a new network

[tcoopman]

Environment

• Elixir version (elixir -v): 1.7.3

• Nerves environment: (mix nerves.env --info)

  
  > mix nerves.env --info
  |nerves_bootstrap| Environment Package List
  
  Pkg:         nerves_system_br
  Vsn:         1.5.3
  Type:        system_platform
  BuildRunner: {nil, []}
  
  Pkg:         nerves_system_rpi3
  Vsn:         1.5.1
  Type:        system
  BuildRunner: {Nerves.Artifact.BuildRunners.Local, []}
  
  Pkg:         nerves_toolchain_arm_unknown_linux_gnueabihf
  Vsn:         1.1.0
  Type:        toolchain
  BuildRunner: {Nerves.Artifact.BuildRunners.Local, []}
  
  Pkg:         nerves_toolchain_ctng
  Vsn:         1.5.0
  Type:        toolchain_platform
  BuildRunner: {nil, []}

|nerves_bootstrap| Loadpaths Start

Nerves environment MIX_TARGET: rpi3 MIX_ENV: dev

|nerves_bootstrap| Environment Variable List target: rpi3 toolchain: /home/thomas/.nerves/artifacts/nerves_toolchain_arm_unknown_linux_gnueabihf-linux_x86_64-1.1.0 system: /home/thomas/.nerves/artifacts/nerves_system_rpi3-portable-1.5.1 app: /home/thomas/Workspace/nerves/multiwifi

|nerves_bootstrap| Loadpaths End

* Shoehorn apps:

iex(multiwifi@nerves.local)11> Shoehorn.children
```elixir
[
  {Shoehorn.ApplicationController,
   {Shoehorn.ApplicationController, :start_link,
    [[init: [:nerves_runtime, :nerves_init_gadget], app: :multiwifi]]},
   :permanent, 5000, :worker, [Shoehorn.ApplicationController]}
]

Current behavior

I have a basic setup, started with the template from nerves_init_gadget, and a working network configured. When I log into an IEx and try to update the network to a new ssid with Nerves.Network.setup this doesn't do anything. I've looked into the code and can't figure out directly why this wouldn't work.

if I do SystemRegistry.register() in the IEx session and then flush, I get the original network configuration. So I thought, if I do Nerves.Network.setup that calls eventually into SystemRegistry.update, I should get the updated information when I flush, but I don't see anything new? So it seems that the new setup isn't passed into the SystemRegistry so, it can't get updated.

Expected behavior

Expected the network to change to the new network passed into setup. I was thinking that this would be a simple workaround for #72, but as this doesn't work, it doesn't help. I've also checked out the branch that is created for #72, but it seems that it's not completely trivial to update the branch for the current version of nerves_network.

[ConnorRigby]

I also noticed this with eth0. I'm not really sure why it's happening. I think it might be a quirk in SystemRegistry. Investigating more right now.

[ConnorRigby]

Fixed in #97