http://appinventor.mit.edu/
evaluate but ignore result
Provides a "dummy socket" for fitting a block that has a plug on its left into a place where there is no socket, such as one of the sequence of blocks in the do part of a procedure or an if block. The block you fit in will be run, but its returned result will be ignored. This can be useful if you define a procedure that returns a result, but want to call it in a context that does not accept a result.
btw, in case you like to use it to connect with bluetooth, see here how to connect correctly
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