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How to get WaitCondition Data in instance

In UserData, I use cfn-singal in MySql instance as below: "/opt/aws/bin/cfn-signal --id 00001 -e 0 -r done --data 'done' '",{ "Ref" : "MySqlWaitHandle" }, "'\n",

My question is, how do I get { id:00001, data:done} from other instance? Say WordProc, thanks!

I tried heat resource-metadata stack WaiHandle, which can get the signal data. But the question is how to get it in instance.