I'd like to revisit this question. I'm looking to do something similar: pair a standard bluetooth speaker with an Arduino, and send simple monotones to the speaker (think park distance control). Is this achievable, even with low data conversion / transfer rates?
I see plenty of articles on how to build a DIY bluetooth speaker. It isn't intuitive to me how receiving and decoding data via bluetooth is inherently easier than transmitting the same data...
pair a standard bluetooth speaker with an Arduino, and send simple monotones to the speaker (think park distance control).
If that is all you want, the "standard bluetooth speaker" is probably grossly under-employed. You just want something that just goes squwark on receipt of a signal. You may not need Arduino to do this. Just a couple of plain-vanilla bluetooth modules may suffice.
Any thoughts on how to implement that Nick?
Not really, I'm afraid. I raise this because I believe you are going outside Arduino's comfort zone with, not only the bluetooth protocols used by the speakers, but also it's ability to generate sound, and for dubious reasons. I suspect Arduino is better employed at controlling sound generated by something else. It is a microcontroller.
Youy might see this if you read between the lines in reply#1.
I imagined that your needs might be served by beeper connected to a bluetooth STATE pin that responds to a signal from another bluetooth. No Arduino involved.