Hello,
I'm developing BLE application using nRF5 SDK (v17), and have some questions.
In the BLE connection topology (e.g. the point-to-point connection),
Is it possible to check the BLE connection channels?
Especially, I want to know about the followings.
1) FHSS data channel maps.
2) the specific data channel of the each data packet to be exchanged.
+ when the BLE connection established, I hope the only useful data channel to be used.
Best regards,
Dae-woong Kim
Hi, Karl
Actually, my sensor nodes, including nRF52840, operates both central and peripheral roles.
They are used to construct multiple BLE connection stream based on NUS, such as below topology.
Example1)
The each node can be connected to the signle upper-node (in this case, the upper node is central, and the interesting node is peripheral), and simultaneously the node can have the lower-nodes up to 3 (in this case, the lower-nodes are peripherals and the interesting node is central).
So, our sensor network could be constructed like fish-bone shape.
Example2)
-
My real problem is the followings.
In the normal cases, where the distance between arbitrary two nodes within about 20 meters, they're working properly.
Also, we checked that the our application can be maintain the sensor network in the case that the nodes should be placed by intervals more than 40 meters. However, if the distance is going far away by such level, it takes a lot of times to complete the connection sequence, and undesirable reset process is occurring many times, until success to connection.
So, I want to know about the ideal "data channels" of the environments (which our system will be applied).
I just think that... if we check the wireless channel status based on RSSI level and figure out that "the BLE channel 1, 5, 7, 20, 32, 35 are good for data communication", then we can fix the FHSS channel maps by the channels what we confirmed right before.
My english is a fool.. :(
I don't know whether my intention is conveyed well...
anyway.. 
Best regrads,
Dae-woong Kim
Hi, Karl
Actually, my sensor nodes, including nRF52840, operates both central and peripheral roles.
They are used to construct multiple BLE connection stream based on NUS, such as below topology.
Example1)
The each node can be connected to the signle upper-node (in this case, the upper node is central, and the interesting node is peripheral), and simultaneously the node can have the lower-nodes up to 3 (in this case, the lower-nodes are peripherals and the interesting node is central).
So, our sensor network could be constructed like fish-bone shape.
Example2)
-
My real problem is the followings.
In the normal cases, where the distance between arbitrary two nodes within about 20 meters, they're working properly.
Also, we checked that the our application can be maintain the sensor network in the case that the nodes should be placed by intervals more than 40 meters. However, if the distance is going far away by such level, it takes a lot of times to complete the connection sequence, and undesirable reset process is occurring many times, until success to connection.
So, I want to know about the ideal "data channels" of the environments (which our system will be applied).
I just think that... if we check the wireless channel status based on RSSI level and figure out that "the BLE channel 1, 5, 7, 20, 32, 35 are good for data communication", then we can fix the FHSS channel maps by the channels what we confirmed right before.
My english is a fool.. :(
I don't know whether my intention is conveyed well...
anyway..
Best regrads,
Dae-woong Kim
