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GRPC Example? (IDFGH-1026) #3352
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Hi @eagi223 We will add this to the to-do list. Although, for now, I do not have concrete timelines for that. |
That would be great! In the meantime I'll keep trying to figure it out. |
I'm interested in the gRPC example on ESP32 too. I checked the esp-va-sdk repo but was not able to find anything. The code appears to be inside of the By the way, there are people interested in this topic since 2016: |
Could you inform if you are using Juniper/grpc-c or just sending the raw protocol buffer packets via HTTP2 ? Are you using |
i am interested too .. any news or solutions ? |
I did it manually encoding and decoding the protocol-buffers packets using I cannot share the code now but you can check these tutorials: https://techtutorialsx.com/2018/10/19/esp32-esp8266-arduino-protocol-buffers/ https://techtutorialsx.com/2019/01/04/esp32-http-2-post-request-with-headers/ |
@kroggen , Thanks very much for your quick reply, i have run encoding code in esp32 using first tutorial , but i dont know more about deconding data from my server (visual studio c#). and what u thing about PJON-GRPC : https://github.com/Halytskyi/PJON-gRPC ?? |
This PJON is new to me. I never used it. But if you have control over the server, why not just use a simple JSON or Binn and simple HTTP? I had to use GRPC simply because the server already exists and the only option was to comply with it. Protocol-buffers in C sucks! |
@kroggen i dont know if i can use it and i want to HTTPS i hope that not a problem ? |
Is there any updates about gRPC ??! |
Hi, I don't know any easy solution to use GRPC on ESP32, but I can share what I did. I separated the process in 2 parts:
Just the protobuf encoded message is not sufficient as payload, we need to add 5 bytes before to comply with the HTTP2 spec. The first byte must be zero (meaning no compression) and the remaining 4 bytes are the size of the message in big endian. I just released the project that uses this method. You can check the sources here You can start by the |
Hm. Any Updates on this ? - We wan't to start a bigger Project with Ethernet, gRPC and CAN on ESP32, but gRPC is neccesary for this :-/ |
This is a very interesting idea! Is anybody working on this feature? It would be great. |
Same - grpc example would be great |
Hi everyone, I'm currently working on an IoT system where the device and the backend communicate with GRPC protocol. Take a look here with minimal working code. https://github.com/iot-tetracube-red/iot-grp-tech-demo |
@Davide-Di-Do Seems like your repo is no longer existent. Could you give me some insight? |
I'd love to see this too. |
@kroggen Thanks for sharing your code and suggestions here. It helped me quite a bit. And it seems like you're right about the prepended 5 bytes. My example code is working now. But looking at the HTTP2 spec, I can't find any mention of these bytes. https://datatracker.ietf.org/doc/html/rfc7540 The DATA frame just has optional padding bytes, and the frame format is quite different. I figured NGHTTP2 handles most of this formatting for me, but clearly the first 5 bytes are required. Maybe I'm missing something, am I looking at the wrong spec? Thanks, |
@chrisomatic |
Thanks for your reply! I just found the reason for this so Ill document it here. The 5 bytes (no compression + length) are a gRPC Message header for the HTTP/2 DATA frames. More details here: https://github.com/grpc/grpc/blob/master/doc/PROTOCOL-HTTP2.md |
This isn't an issue, but more of a feature request I suppose. This has been asked in the forum, but the thread hasn't had a reply since February...
here
So it looks like the ESP Voice Assistant SDK uses Google Dialogflow through the gRPC hooks. Is there any way we could get a generic example of using gRPC in the IDF? Or maybe someone out there has some code they'd like to share where they've implemented gRPC on the ESP32?
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