Which Web Bluetooth operations should not be done in parallel

[François Beaufort 🇫🇷]

I'd like to provide guidance on which Web Bluetooth operations should not be done in parallel.

Ideally, I'd like all of them to be able to work in parallel but some can't right now IIRC.

Here are the ones I think would work for now:

GATT Server Disconnect

getPrimaryService*()

getIncludedService*()

getCharacteristic*()

And the ones we can't use with Promise.all for instance:

GATT Server Connect

Read Characteristic

Write Characteristic

Start GATT Notifications

Stop GATT Notifications

Can you confirm/rectify?

Thank you,

Francois

[Joe Medley]

Francois,

It sounds like this is a temporary problem and should NOT be incorporated into permanent documentation.

Can you please confirm?

Joe

Joe Medley | Technical Writer, Chrome DevRel | jme...@google.com | 816-678-7195

If an API's not documented it doesn't exist.

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[François Beaufort 🇫🇷]

I'm not sure if it is a temporary problem or not actually.

For info, I am testing these operations with https://beaufortfrancois.github.io/sandbox/web-bluetooth/promise-all/ and I'll share my findings when I can test on all platforms. 

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[Jeffrey Yasskin]

We have a discussion about this at https://github.com/WebBluetoothCG/web-bluetooth/issues/188. We don't yet have consensus about whether the implementation should take steps to serialize anything that needs to be serialized, or whether websites should do it. For now, Chrome doesn't, so anything Android can return InProgress for, we can too. You probably have the right set.

This is something that should make it into the spec, but I'm not going to have time before I disappear for parental leave. If someone else wants to edit it in, go ahead.

We should probably say something like this on public-web-bluetooth too.

On Tue, Oct 18, 2016 at 7:30 AM, 'François Beaufort 🇫🇷' via web-bluetooth <web-bl...@chromium.org> wrote:

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[Giovanni Ortuño]

I think it's just Connect, Read, and Write. We recently added queuing for notifications.

On Wed, Oct 19, 2016 at 8:00 AM Jeffrey Yasskin <jyas...@chromium.org> wrote:

We have a discussion about this at https://github.com/WebBluetoothCG/web-bluetooth/issues/188. We don't yet have consensus about whether the implementation should take steps to serialize anything that needs to be serialized, or whether websites should do it. For now, Chrome doesn't, so anything Android can return InProgress for, we can too. You probably have the right set.

This is something that should make it into the spec, but I'm not going to have time before I disappear for parental leave. If someone else wants to edit it in, go ahead.

We should probably say something like this on public-web-bluetooth too.

On Tue, Oct 18, 2016 at 7:30 AM, 'François Beaufort 🇫🇷' via web-bluetooth <web-bl...@chromium.org> wrote:

I'd like to provide guidance on which Web Bluetooth operations should not be done in parallel.

Ideally, I'd like all of them to be able to work in parallel but some can't right now IIRC.

Here are the ones I think would work for now:

GATT Server Disconnect

getPrimaryService*()

getIncludedService*()

getCharacteristic*()

And the ones we can't use with Promise.all for instance:

GATT Server Connect

Read Characteristic

Write Characteristic

Start GATT Notifications

Stop GATT Notifications

Can you confirm/rectify?

Thank you,

Francois

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[François Beaufort 🇫🇷]

Here are not supported parallel operations and their respective errors I've found on Dev Channel (55.0.2883.17):

Android: 

readValue - DOMException: GATT operation failed for unknown reason.

writeValue - DOMException: GATT operation already in progress.

Chrome OS / Linux:

connect - DOMException: Connection failed for unknown reason.

readValue - DOMException: GATT Error Unknown.

writeValue - DOMException: GATT operation already in progress.

Mac OS:

readValue - DOMException: GATT Error: Not supported.

writeValue - DOMException: GATT operation already in progress.

stopNotifications is not implemented yet.

As you can see, parallel connects works fine on Android while they're not on other platforms.

readValue error message is not consistent across platforms.

stopNotifications is not implemented yet on Mac OS but I suspect it should work fine eventually.

If some are unexpected, we should definitely file bugs.

And we should at least mention those in https://github.com/WebBluetoothCG/web-bluetooth/blob/gh-pages/implementation-status.md#chrome for developers.

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[François Beaufort 🇫🇷]

Nit: As you can see, parallel connects works fine on Android and Mac OS while they're not on other platforms.

[Jeffrey Yasskin]

Thank you for testing this! Would you update https://github.com/WebBluetoothCG/web-bluetooth/issues/188 with that as the current implementation state? I'll try to get it into the spec before I disappear.

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[Vincent Scheib]

+1 update the issue as FYI, I'm not sure that it drives to a consensus for what to do. 

jyasskin what are you intending to get into the spec?

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[Jeffrey Yasskin]

I'd like to say that these operations may return a NetworkError if the UA/platform is currently using the device in any way. I'm not certain that NetworkError is the right error, but it's what we use: https://cs.chromium.org/chromium/src/third_party/WebKit/Source/modules/bluetooth/BluetoothError.cpp?l=68-69.

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[Vincent Scheib]

Thanks, SGTM

[François Beaufort 🇫🇷]

I've just posted https://github.com/WebBluetoothCG/web-bluetooth/issues/188#issuecomment-255121220.

Thanks, SGTM

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