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I’m sorry, I’ve never tried anything with Bluetooth, so I’m only guessing here.
If the Bluetooth chip is that simple, and you have it connected to TXD and RXD on your Mayfly, you should print to the bluetooth using just
Serial.print and not do anything with SoftwareSerial.
Serial is the TXD and RXD on the Mayfly. You could also connect it to TX1 and RX1 and use
Serial1instead of sharing with the FTDI/PC output.
The range of Bluetooth is very short under water (a few inches) so your users wouldn’t be able to do a float-by download. They would most likely still need to pull the logger out of the water, and then initiate the Bluetooth connection. Once it’s out of the water, though, you hopefully could get the data without actually opening the sealed box.