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length of Ble advertising and signal strength

Mostafa Haghi
Prodigy 60 points
Other Parts Discussed in Thread: CC2650

Hello

I'm working with cc2650 sensor tag. We have three nodes and these nodes are supposed to construct a network through Ble. The node1 is advertising MH1, node2, MH2 and node3, MH3.

When the node 2 is in the range of node 1, these two are connected and node2 starts advertising MH1,MH2. So far everything is fine and the maximum distance that node may connect is 22 m. When node3 is in the range of node2, it is connected to node 2, and in fact node3 starts advertising MH1,MH2,MH3. 

The problem is the range of node2 and node3. this distance is only 9 meter in maximum. otherwise, it gets disconnected.

Nod1...................Node2 =22m

Nod2.....................Node3 = 9m.

I would appreciate if anyone can assist to understand the reason.

Is the packet advertising length may affect this much adversely?

Best regards.

  • 0
    TI__Mastermind 40460 points
    Hi Mostafa,

    Are you trying to create your own mesh network in some way? If so, you could check out our TI-OpenThread and Zigbee mesh solutions.
    e2e.ti.com/.../thread-vs-zigbee-what-s-the-difference

    Otherwise, I would check what your transmit power and your receive sensitivity is on all your devices.
    HCI_EXT_SetTxPowerCmd() can be used to set TX power. HCI_EXT_SetRxGainCmd() can be used for RX gain.

    API Guide:
    dev.ti.com/.../

    If you are trying to make your own BLE Mesh, we don't currently support that and I won't be able to help you further as I'm not familiar with the BLE mesh protocol.
  • 0 in reply to Evan W
    Prodigy 60 points

    Thanks for the replay.

    Yes, I'm trying to somehow connect and create the node through my mesh. However, I'm not sure this is called mesh where only nodes are advertising the name through updating the devlist.

    If I'm right, you mean the mesh topology for BLE is not possible to be implemented in sensor tag?

    Best regards

  • 0 in reply to Mostafa Haghi
    TI__Mastermind 40460 points
    Mostafa,

    I'm not exactly clear on what you mean by your mesh and then later saying that it's not mesh.

    When i say mesh, I mean as far as the actual BLE mesh protocol that is defined by Bluetooth SIG, we do not support this.