iApp variable scope

Hi all,

I'm writing my first iApp to automate deployment of a few virtual servers, nodes, pools and iRule data-groups

I have finished the presentation section and am now starting on the implementation. One issue that I'm having though is referencing variables assigned from the presentation within tmsh::create, tmsh:modify etc

I can read the variables back fine within the base iApp, for example I have the following:

puts "Adding SNAT data.  $::private__privateAddr maps to $::public__publicAddr"

Which logs the following in scriptd.out:

Adding SNAT data.  xxx.xxx.xxx.xxx maps to xxx.xxx.xxx.xxx

Where I run into the issue though is referencing the same variables in tmsh::modify.

For example I have the following:

proc tmsh_modify { args } {
    set args [join $args]
    puts "tmsh modify $args"
    tmsh::modify $args
    return [lindex $args [lsearch -glob $args "*_*"]]
}

puts "Adding SNAT data.  $::private__privateAddr maps to $::public__publicAddr"

tmsh_modify { ltm data-group internal /Common/snat-map
  records add { 
    $::private__privateAddr { 
      data $::public__publicAddr
    } 
  }
}

This logs the following:

[root@ltm02-dev:Active:Changes Pending] config  tail -f /var/tmp/scriptd.out -n0
    Adding SNAT data.  xxx.xxx.xxx.xxx maps to xxx.xxx.xxx.xxx
    tmsh modify  ltm data-group internal /Common/snat-map
      records add { 
        $::private__privateAddr { 
          data $::public__publicAddr
        } 
      }

So from this I can see the variables are being treated as normal strings. As expected this errors out on the iApp creation screen:

script did not successfully complete: ("$::private__privateAddr" invalid address
    while executing
    "tmsh::modify $args"
    (procedure "tmsh_modify" line 4)
    invoked from within
    "tmsh_modify { ltm data-group internal /Common/snat-map
    records add { 
    $::private__privateAddr { 
    data $::public__publicAddr
    } ..." line:14)

I couldn't find any specific information on the scope of variables when used in this manner, perhaps it is just a simple issue of syntax.

I'd appreciate if someone can give me some guidance on this.

Thanks!