Posting to Twitter

Has anyone experienced any problems just posting an informational tweet, rather than a command tweet? 

I've written a Plugboard script to alert me when energy usage goes over a certain threshold, currently set low for testing.  However, more often than not, the tweet will never show up, after a bit of trouble shooting, I think the xap-twitter process may be deleting it as soon as it's sent it.  I've been through the Wiki a couple of times, and it does say that tweets will be deleted once actioned, but there is also an example of how to send a "Hello World" tweet.

Here is an example of the xAP messages that get generated when my script runs, and the script itself.  Perhaps a Forum area could be setup to share scripts in the future.

xAP-header
{
v=12
hop=1
uid=FF00D800
class=xAPBSC.cmd
source=dbzoo.livebox.Plugboard
target=dbzoo.livebox.Twitter
}
output.state.1
{
id=*
text=Energy usage is 891 kW
}


xap-header
{
v=12
hop=1
uid=FF00D900
class=alias
source=dbzoo.livebox.Twitter
}
command
{
text=Energy usage is 891 kW
}

And the Lua script

-- Tweet when CurrentCost reports more than 2kW

function init()
  register_source('dbzoo.livebox.CurrentCost:ch1.0', "dosource")
  watts_high_threshold = 600
  current_watts = 0
end

function tweet(msg)
   xap_send(string.format("xap-header\
{\
target=dbzoo.livebox.Twitter\
class=xAPBSC.cmd\
}\
output.state.1\
{\
id=*\
text=%s\
}", msg))
end

function dosource()
  if xAPMsg.class == "xAPBSC.event" then
        current_watts = xapmsg_getvalue("input.state","level")
        print (string.format("Current Watts = %s", current_watts))
        if tonumber(current_watts) > watts_high_threshold then
          tweet(string.format("Energy usage is %s kW", current_watts))
        end
  end
end

Any ideas or experience on this problem or using Twitter would be greatly appreciated.

Thanks

Karl