The WriteStrings blocks says the values parameter is "A list of values to write to the device." If a list is passed I get an error: "Unable to convert ______ of type gnu.lists.FString to type java.lang.String" If I pass just the string, it works. :smiley: I saw a reference to this back in 2019 a…

Here's another attempt. I forgot to short-circuit a loop and I think that leads to the last error mentioned. edu.mit.appinventor.ble.aix (202.3 KB)