Increase device limit beyond 48 devices about zigbee2mqtt HOT 22 CLOSED

Yes, the device limit refers to the number of devices that can be paired to a single coordinator. You can use more of course.

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add the "TC_LINKKEY_JOIN" compile on the preprocessor option

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Is there a way to get the a link to the firmware source code with details on how to build it as well?

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@oskarn97 would it be possible to share any details on how you compiled this firmware?

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It is not possible to increase the device limit beyond 48 devices since to memory limitation on the Chip. I compiled the Z Stack Home with IAR Embedded Workbench with some flags required for encryption and maximum device limit.

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Would it be possible to reduce the size of the firmware so there is more memory left for devices? http://processors.wiki.ti.com/index.php/Optimizing_Flash_and_RAM_Usage_of_Z-Stack_for_CC2530

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I doubt if NWK_MAX_DEVICE_LIST defines the maximum number of devices in the network. In this official Texas Instruments document chapter 4 Z-Stack Knobs they are talking about a 400+ nodes network while only having set NWK_MAX_DEVICE_LIST to 10. I have the feeling that when adding more routers to your network you can add more nodes to your network.

Maybe 48 devices is not the limit at all....

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@oskarn97 Could you still tell us what you changed / done to compile the firmware and how to generate the .hex file ?

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I've just increased the device limit and enabled secure link join. Apart from that I did not modify the default TI Z Stack Home.

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By reducing the MAXMEMHEAP in OnBoard.h to e.g. 1000 I was able to compile with NWK_MAX_DEVICE_LIST 90.

@oskarn97 how did you enable secure link join?

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@Koenkk Is it safe to reduce MAXMEMHEAP?

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@ptvoinfo we need to do some tests with it.

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I think it's not possible to reduce the heap size, I'm getting the same error as #65 in this case.

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I've created a wiki page which explains how to add more than 48 devices to your network.

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@Koenkk @oskarn97 wouldn't we solve the memory problem by using a dongle with a CC2538 SoC? It has up to 32KB instead of 8KB.

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@makuser maybe; but that setup is much more expensive.

For now I don't see any problem when using the CC2531/CC2530 with the current firmwares. It's stable even for larger networks.

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I have 32 xiaomi zigbee devices...
I need to use 1 coordinator e 2 router CC2531 to manage all 32 devices?

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@vpomax could be a bit tricky, I would recommend adding another CC2531 router to be sure.

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@cmorlok yes, but note that that firmware could have some downsides. It has less memory available which could lead to freezing and less responsive devices.

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Is the limit for cc2530 the same?

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Yes

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