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mySerial.flush() is forgot,You have forgotten to add mySerial.flush().
mySerial.flush()
mySerial.flush() waits for the transmission of outgoing serial data to complete.
Add it right after you have sent the data and want to change the DE pin status.
mySerial.flush() is forgot, add it right after you have sent the data and want to change the DE pin status.
You have forgotten to add mySerial.flush().
