GetDevice() in LUA predicate

[Zubetto]

Hello!

 

I'm not very familiar with programming, so hope for understanding)

 

How can I use the function GetDevice(ID) in LUA predicate trigger condition?

 

When I start my mission with this LUA predicate code

 

 
local dev = GetDevice(20):get_frequency()
local tune = (math.abs(dev-116000000)) <= 1999
return tune

the following error is occurs:

 

... attempt to call global 'GetDevice' (a nil value) ...

 

How to make this function being visible in LUA predicate? Please help!

[Нупь]

MainPanel = GetDevice(0)

local dev = MainPanel:get_argument_value(20)

local tune = (math.abs(dev-116000000)) <= 1999

[Zubetto]

thank you for quick response, but it seems, will not work, cause GetDevice isn't visible and no matter what arguments I will use