sending photo with zigbee

[Ndemir]

I take a photo with ov2640 camera. I try to send this photo with zigbee protocol from router to coordinator. I achive this but there is a problem. After I send a photo the communication is locked totally and I can't send any data.
Does zigbee protocal support to send this big data that I try to send?

[Peter BENSCH]

Welcome @Ndemir, to the community!

This reminds me of the early days of email from the last millenium, when 56k modems were still common. Back then, someone had packed a CD into a ZIP archive and tried to send it by email. It was only a ‘small’ ZIP...

No, seriously: Zigbee was not developed for such data volumes, but ‘to create personal area networks with small, low-power digital radios, such as for home automation, medical device data collection, and other low-power low-bandwidth needs, designed for small scale projects which need wireless connection.’ [Wikipedia]

If you want to transmit images, you should use other suitable methods, such as WiFi.

Hope that answers your question?

Good luck!
/Peter

[Ndemir]

Hello Peter,
Could you explain in technical terms why, after sending a photo once, we are unable to send a second one, and why the communication completely locks up, preventing us from sending any data?
Best regards,

[Andrew Neil]

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@Ndemir wrote:

Could you explain in technical terms why, after sending a photo once, we are unable to send a second one

---

As @Peter BENSCH said, it's impossible to say without a detailed analysis of your implementation.

It might not even be a limitation of Zigbee as such; it might just be a fault in the way you handle the data - especially as you say it works once, but not a 2nd time.

That suggests that you do not properly "clear up" at the end of your sending - so focus your debugging on what is different between the first (successful) transmission, and subsequent attempts...

[Peter BENSCH]

Without knowing your current environment and the programming of the device and coordinator, I cannot make any statements. Ultimately, your problem boils down to debugging your system, e.g. sniffing the traffic with the help of Wireshark.

[Ndemir]

Hi Andrew,

Thank you for your answer, I have hundreds maybe thousands of router (it can be thought 1000). I wanna send photo from every routers to coordinator when my sensors triggered. Is it possible to control this data traffic. 

 

[Andrew Neil]

As @Peter BENSCH said, this is really not what Zigbee is designed for - why did you choose Zigbee?

But, anyhow, as far as the network is concerned, it's all just data - so long as you abide by the protocol rules, the data will flow.

But it's highly likely that thousands of nodes all sending huge files (photos) will simply overload the network's capacity.

[Ndemir]

I chose this due to the mesh structure and the high number of connected devices. Do you have any other protocol recommendations that would be suitable for the structure I mentioned?

[Andrew Neil]

WiFi would seem an obvious choice?

Why do you particularly need a mesh?

from: https://www.emnify.com/iot-glossary/guide-iot-protocols 

Not sure that their depiction of "BLE" accounts for the v5 2M PHY ?

Also not shown on that (too new?)  is the 5G DECT NR+

https://www.5gtechnologyworld.com/the-first-non-cellular-5g-standard-dect-nr/ 

https://www.dect.org/nrplus 

Maybe also look at Matter?

 

[Ndemir]

A large number of devices will be operated in a very large area. Devices that are far away cannot establish a connection, so we need routers.

[Andrew Neil]

Define "far".

What kind of environment - indoor? outdoor? etc ...

You know that WiFi mesh is a thing?

Looks like the 5G DECT NR+ can do up to ~ 3km

https://www.dect.org/news.aspx?id=390

 

[Ndemir]

the environment will be outdoor. Can it send a photo from 3 km away? This distance might be sufficient for me.

[Andrew Neil]

Again, as far as the radio is concerned, it's all just data.

[Ndemir]

Thank you for your answers. I will research what you said. Do you have any information about zigbee table routing?

[Andrew Neil]

There's a separate thread for that:

https://community.st.com/t5/stm32-mcus-wireless/zigbee-table-routing/td-p/734343