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NordicSemiconductor / Android-nRF-Mesh-Library

The Bluetooth Mesh Provisioner and Configurator library.
https://www.nordicsemi.com/
BSD 3-Clause "New" or "Revised" License
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How to operate one mesh network with multiple devices/app instances at the same time? #443

Closed NanaDada closed 3 years ago

NanaDada commented 3 years ago

Describe the bug Unable to use a mesh network on multiple Android devices at the same time.

To Reproduce Steps to reproduce the behavior:

  1. Export a mesh on one Android device by calling MeshManagerApi.exportMeshNetwork()
  2. Import the mesh on another Android device by calling MeshManagerApi.importMeshNetwork()
  3. Connect with both devices to the mesh network.
  4. Only one device can use the mesh network. Commands from the second device a ignored.

Expected behavior Both devices should be able to use the mesh.

Platform details:

Imagine you want to operate a Mesh network with multiple Android devices. How do you copy the mesh across devices, so that all devices can use the mesh at the same time (i.e. in parallel)?

To share the mesh across devices, my app calls MeshManagerApi.exportMeshNetwork() and MeshManagerApi.importMeshNetwork(). This is basically working: Reboot the mesh, start the app on any of the devices and you can connect and use the mesh. So far, so good.

The problem arises as soon as a second instance of the app connects to the mesh: Then all commands sent from the second instance are simply ignored. Now the question is why, and how to fix it?

Do you have any ideas what could be wrong here? Is it sufficient to just call MeshManagerApi.exportMeshNetwork() and MeshManagerApi.importMeshNetwork(), or is there anything else that needs to be done to allow multiple instances access the mesh at the same time?

roshanrajaratnam commented 3 years ago

So do you use the same provisioner from the second instance? if so the messages sent from the second instance would be ignore because of the sequence numbers keep incrementing. So you would have to create a new provisioner on the second device with a different address and this should help I believe.

On another note, I will get to your other issues as soon as I get some time because I am a bit busy with some other tasks at the moment.

NanaDada commented 3 years ago

Thanks for the hint! I've ended up adding a bunch of provisioners and a setting to chose one.