Yes, sorry, I updated my question after posting ;-)
I think Bluetooth 4.2 is fine in general as it supports the vast majority of use cases.
Regarding the MTU: Is an increased MTU size possible without Data Length extension?
Also, what does the current Espruino stack do with an incoming gatt MTU request? Does it ignore the request or does it respond with an error? My gut feeling is the sensor should not use an MTU of 40 bytes unless the Central device has acknowledged it.
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