What is the SmartThings hub's IP address?

Developer Programs Writing Edge Drivers
1

I see st/driver.lua Driver:environment_info_handler saves this information in self.environment_info.hub_ipv4 and notifies self:lan_info_changed_handler with the address.

I set up my Driver with a lan_info_changed_handler.
It never gets called and self.environment_info.hub_ipv4 is not set.

I can see in the log that Driver:environment_info_handler is called with zigbee and zwave information

Received event with handler environment_info
Received event with handler environment_info
Z-Wave hub node ID environment changed.

… setting …

driver.environment_info.hub_zigbee_eui
driver.environment_info. hub_zwave_id

… but never

driver.environment_info.hub_ipv4

Certainly, the SmartThings hub has an IP address.
Why won’t it share it with me?

2

@nayelyz ?

3

Hi!

Does this mean you set a custom lan_info_changed_handler in the driver?

4

Yes, but it is never called and the log suggests that its caller is never called (this information is not fed to my driver over the environment channel).

5

Ok, I was able to replicate the issue with the value of driver.environment_info.hub_ipv4 being null.

The team mentioned this is a known issue that will be solved in a future release (there’s no ETA yet).
For now, the workaround is to create a UDP socket and query its name, which will more reliably provide the IP address. For example:

local function find_hub_ip(driver)
    --First check if the hub_ipv4 is known
    if driver.environment_info.hub_ipv4 then
        return driver.environment_info.hub_ipv4 
    end
    --If not, use this other method
    local s = cosock:udp()
    -- The IP address here doesn't seem to matter so long as it isn't '*'
    s:setpeername('192.168.0.0', 0)
    local localip, _, _ = s:getsockname()
    return localip
  end
6

… and

s:close()

Yes, it should be fixed but, I think, your workaround is better because

  1. It works even before this information would come over the environment channel.
  2. It works even outside the SmartThings hub environment, where …
  3. On multi-homed hosts, if setpeername uses the address of a potential peer, getsockname will return the address of the interface on the route to that peer (the address that peer can reach me at). Ultimately, that is what I want.

Thank you!

1 Like