What can I to do with:
Discarding duplicate packet from node ...
Received SOF, while awaiting ACK
repeated for some (always powered) devices.
Discarding duplicate packet from node ... Received SOF, while awaiting ACK
-
seattleneil
- Posts: 172
- Joined: 02 Mar 2020 22:41
Re: Discarding duplicate packet from node ... Received SOF, while awaiting ACK
This is a symptom of RF issues. Fortunately, the Z-Way expert UI has excellent tools to show you signal strength, background noise and retransmissions. This level of visibility is one of the most important features of Z-Way and is the basis for creating a fast and reliable Z-Wave network.
Check out packet stats using this link: http://[YOUR PI IP ADDRESS]:8083/expert/#/installer/packets
For the RSSI value, the less negative, the better (e.g., -65 is better than -77).
You can see the background noise level using this link: http://[YOUR PI IP ADDRESS]:8083/expert/#/installer/rssi
If background noise frequently exceeds -80 dBm, then you should move your Pi to a less noisy location. Since the Pi itself generates RF noise, having a RaZberry module with an external antenna can make a huge difference.
A convenient way to understand the health of your Z-Wave network is to check the timing stats using this link: http://[YOUR PI IP ADDRESS]:8083/expert/#/network/timing
Small numbers (less than 10) are excellent. Numbers higher than 10 are okay and likely mean the packet traversed an intermediate node. Numbers higher than 25 (i.e., 250 milliseconds) are noticeable and should be addressed by changing the routing map for that device or doing a network reorganization.
If background noise and signal strength are not problems, a less common cause is due to excessive packet retransmissions when multiple devices try to communicate simultaneously. This is more likely if it's a large Z-Wave networks with "talkative" devices. The packet stats and timing stats will show you if this is the problem.
Check out packet stats using this link: http://[YOUR PI IP ADDRESS]:8083/expert/#/installer/packets
For the RSSI value, the less negative, the better (e.g., -65 is better than -77).
You can see the background noise level using this link: http://[YOUR PI IP ADDRESS]:8083/expert/#/installer/rssi
If background noise frequently exceeds -80 dBm, then you should move your Pi to a less noisy location. Since the Pi itself generates RF noise, having a RaZberry module with an external antenna can make a huge difference.
A convenient way to understand the health of your Z-Wave network is to check the timing stats using this link: http://[YOUR PI IP ADDRESS]:8083/expert/#/network/timing
Small numbers (less than 10) are excellent. Numbers higher than 10 are okay and likely mean the packet traversed an intermediate node. Numbers higher than 25 (i.e., 250 milliseconds) are noticeable and should be addressed by changing the routing map for that device or doing a network reorganization.
If background noise and signal strength are not problems, a less common cause is due to excessive packet retransmissions when multiple devices try to communicate simultaneously. This is more likely if it's a large Z-Wave networks with "talkative" devices. The packet stats and timing stats will show you if this is the problem.