Update
rex_firebase plugin: fix bug in expression:LastData
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Previous capx also fixed, tested fine in my PC. You might try again, but... I don't think that it will work on cocoon.io.
The behavior of connection detecting is
- connection state is shown at private reference "/.info/connected", read value at this reference
a. value = false (LastData = 0) : disconnected
b. value = true (LastData = 1) : connected
Initially, this value is false.