Return different writable streams depending on whether writing without response is permitted #19
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…t response is permitted
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Can we defer creation of the two writables until this ternary resolves, to avoid the spurious object creation?
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just made an update, how does that look?
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When constructing a new transport, it seems that on some systems writing without a response is not permitted (based on the writeWithoutResponse property: https://developer.mozilla.org/en-US/docs/Web/API/BluetoothCharacteristicProperties).
This PR retains the current default behavior (without response) for boards that support it, but adds support for boards where this is not enabled.