need help to send last image through MQTT

[Bloodboy1986]

Hi guys,

this project is amazing :)

I'm currently trying to send the current image via mqtt and already have a proof of concept for it.

However, I still have the problem that I can not find the current image. At the moment I am still using a static test image.
I know that the current image can be retrieved via the URL /img_tmp/alg_roi.jpg. However, I can't find it on the sdcard.
Maybe one of you would be so kind and help me with this? :)

My c/c++ knowledge is not the best either...

If you interesset i will create a PR later on.

[caco3]

I think the image does not get stored to the sd-card at all.

As far as I can see, the image gets provided on the fly, see https://github.com/jomjol/AI-on-the-edge-device/blob/rolling/code/components/jomjol_flowcontroll/ClassFlowControll.cpp#L579
You might be able to call function GetJPGStream() like in https://github.com/jomjol/AI-on-the-edge-device/blob/rolling/code/components/jomjol_tfliteclass/server_tflite.cpp#L51.

[jomjol]

@caco3 is totally right. Background is, that we want to avoid too much sd-card reading, as this has created a lot of trouble in the past.
If you want to change this, you need to modify the code. You you can also activly pull the image via http://IP-ADRESS/img_tmp/raw.jpg or .../alg.jpg or .../alg_roi.jpg

[Bloodboy1986]

Thanks for your answers :)

I already tried retrieving the image directly , however it seems to load the esp a lot when doing so, especially when it's processing. It has often happened that I could not retrieve the image.
So I thought it would be easy to send the current image via mqtt after the flow has finished.

So you thing, i can just call GetJPGStream() to get the actual image?
I think i dont need the image as file....

I would be very happy to have your help :)

[jomjol]

No, the function esp_err_t ClassFlowControll::GetJPGStream(std::string _fn, httpd_req_t *req) is directly sending an image to http-request (req).
There is no function, where you can directly get the image as an result.

[caco3]

Is this function used?

AI-on-the-edge-device/code/components/jomjol_flowcontroll/ClassFlowAlignment.cpp

Line 159 in aaad952

bool ClassFlowAlignment::doFlow(string time)

There is a function

AI-on-the-edge-device/code/components/jomjol_flowcontroll/ClassFlowAlignment.cpp

Line 207 in aaad952

ImageTMP->SaveToFile(FormatFileName("/sdcard/img_tmp/alg_roi.jpg"));

I would not save it to the sd-card as this would destroy the sd-card quickly!
How ever you maybe could store the image in a global variable and use it from there.

[Bloodboy1986]

Hello guys,

sorry for my late feedback, but in Germany was a long weekend due to a holiday and I was on vacation :)

I have now looked at the whole thing again and as a workaround and plan B I let first write the current image on the sdcard. But I also see it as very problematic. The only way out would be to use an ENDURANCE or INDUSTRIAL sdcard...

I must admit that I do not get warm with c++ :(
I think I understood that CImageBasis is some kind of construct which contains the current image. I created my own function which returns me only the CImageBasis, just like in "GetJPGStream", only without the http part. Only how I process this now, I'm really overwhelmed....

Maybe one of you has once again time and interest to help me :)
At the end I need the current image as filestream in binary form.

[Bloodboy1986]

Hello all,

sorry for my late feedback :)

Again I have spent several days to find out how and where the image is stored. Unfortunately without success...

I would also like to support you in the development, even if the topic "image by mqtt" is a very special case for me.
But maybe you will help me once again!
I would also create a PR at the end that contains everything :)

What I have done so far...