There is another thread talking about USB support: 
https://groups.google.com/g/grpc-io/c/MZCVUShRMkM/m/y3T_fs8iAQAJ but I 
cannot answer there since my messages are automatically deleted (don't know 
why)


On Saturday, 13 February 2021 at 09:55:42 UTC+1 Frédéric Martinsons wrote:

> Hello all,
>
> Some years ago we had the exact same use case where we have an android 
> application which drive an embedded devices (in USB Accessory Mode). The 
> only way to communicate with this device is through USB channel and we 
> wanted to use gRPC.
> So we develop the USB transport channel in gRPC bask in 2018 (based on 
> gRPC v1.13.0).
> The guy from our teams that made these patches had now leaved but I'll be 
> glad to submit a patch series if the USB support is still foreseen to be 
> support but I may not be able to answer all the questions about tricks that 
> came in this code.
>
> Do you want to receive a merge request ?
>
> Thanks for the good works gRPC guru.
>
> On Thursday, 8 February 2018 at 17:18:21 UTC+1 [email protected] wrote:
>
>> Mark, as Abhishek mentioned, it is quite useful in cases where a target 
>> device (usually embedded) has no networking. Thanks Vijay, I'll have a look 
>> at your suggestions.
>>
>> Regards
>> /Robert
>>
>> 2018-02-07 22:31 GMT+01:00 'Vijay Pai' via grpc.io <
>> [email protected]>:
>>
>>> As Mark mentioned, it's not on our roadmap, but if you wanted to put one 
>>> together, I can suggest 
>>> https://github.com/grpc/grpc/blob/master/doc/core/transport_explainer.md 
>>> for an idea of what transports need to do. If the goal is a simple 
>>> message-oriented transport without reference to complex flow control, I can 
>>> suggest using the in-process transport as a model for how to build a 
>>> transport, as it's only a few hundred lines of code and implements the 
>>> transport ops required to actually have working RPCs for its context; this 
>>> might make a lot of sense if your controller is memory-mapped. 
>>> Alternatively, if your controller is mapped as a file, a path forward might 
>>> be to make a new endpoint akin to the UDS endpoint. This would mean that 
>>> you'd be speaking HTTP/2 over your HID, but again it may be a fairly simple 
>>> integration.
>>>
>>> Good luck!
>>>
>>> - Vijay
>>>
>>> On Friday, February 2, 2018 at 8:51:23 PM UTC-8, Robert Bielik wrote:
>>>>
>>>> Hi all,
>>>>
>>>> Has there been any work on using USB HID as a gRPC transport ? 
>>>>
>>>> Regards
>>>> /Robert
>>>>
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