Cannot read anything from device?

[gazzer82]

I am attempting to read some data from a network switch over ssh.

I can connect fine, but I always get a timeout waiting for data to be returned:

defmodule FibreTestUi.Ssh do
  defp connect do
    SSHEx.connect(
      ip: '192.168.1.1',
      user: 'admin',
      password: '!Password',
      modify_algorithms: [
        {:append, [{:kex, [:"diffie-hellman-group-exchange-sha1"]}]},
        {:append, [{:public_key, [:"ssh-rsa", :"ssh-dss"]}]}
      ]
    )
  end

  def list_port_status do
    {:ok, conn} = connect()
    SSHEx.cmd!(conn, 'show interfaces transceiver')
  end
end

When I call this I always get:

** (RuntimeError) {:error, "Timeout. Did not receive data for 5000ms."}
    (sshex 2.2.1) lib/sshex.ex:100: SSHEx.cmd!/3
    iex:1: (file)

If I manually SSH into the switch and enter the same command, then press enter/return I get a long stream of data back.

I've tried adding /r to the command, and increasing the exec_timeout (thought when testing I get the response in circa 1 second) with no change.

Any idea what I'm doing wrong here? Help greatly appreciated!

[moomerman]

In case anyone lands here in future, you can pass the :exec_timeout opt to theSSH.cmd! function, using the example above you would do:

SSHEx.cmd!(conn, 'show interfaces transceiver', exec_timeout: 60_000)

for a 60s timeout.