Add option to override serial_number for running on host

[lawik]

Need to test this with a patched up nerves_time because they are fighting.

[lawik]

Now this only offers the serial number override.

[oestrich]

You can also override the serial number by the host config for the nerves runtime kv. I think you need to set this anyways for nerves hub link to function properly on a host?

This is what I have in my dev app for nerves hub

config :nerves_runtime,
  kv_backend:
    {Nerves.Runtime.KVBackend.InMemory,
     contents: %{
       "nerves_fw_active" => "a",
       "a.nerves_fw_uuid" => "6d5566a3-0b09-5ed2-841d-0223c77ce702",
       "a.nerves_fw_product" => "forgery",
       "a.nerves_fw_architecture" => "arm",
       "a.nerves_fw_version" => "0.5.1",
       "a.nerves_fw_platform" => "rpi0",
       "a.nerves_fw_misc" => "extra comments",
       "a.nerves_fw_description" => "test firmware",
       "nerves_fw_devpath" => "/tmp/fwup_bogus_path",
       "nerves_serial_number" => "forgery"
     }}

[lawik]

I did set that. But nerves_hub_link talks directly to Nerves.Runtime.serial_number which will directly ask board id and my "device" gets the name "unconfigured". Hence, this :)

[oestrich]

Ah, this is for the shared secret way of connecting. That explains why I didn’t need to set it to get connected properly since I’ve got a cert

[lawik]

That explains that :)

[lawik]

Hold on, is there some other call we could make that would vrab it from KV and is will KV pick up from boardid?

[jjcarstens]

The way I get around this is I make a small script for a serial number that I set as the boardid file

#!/bin/sh

# pick your favorite serial number by default
# or set it on run with SERIAL=abc123 iex -S mix
serial=${SERIAL:-default_1234}

echo -n "$serial"

# some config.exs for host

config :nerves_runtime, boardid_path: /path/to/host/boardid

I'm not sure this needs to go in a library but prob a tip as it applies to all the libs you want to test on host (which I'm a huge advocate for)

[lawik]

Josh had a thing for it already:

config :nerves_hub_link,
  device_api_host: "devices.nervescloud.com",
  shared_secret: [
    product_key: System.get_env("NERVES_HUB_KEY"),
    product_secret: System.get_env("NERVES_HUB_SECRET"),
    identifier: System.fetch_env!("NERVES_SERIAL_NUMBER") # THIS
  ]