Lag on RSSI reading for Bluno

Help & Support
1

Hi!

I am working with a Bluno Nano Arduino BLE (Product Code: RB-Dfr-572). It’s running 1.97 firmware. I have no problem getting the RSSI value when I have made a connection with another device, but I find the RSSI value is not updated in real-time. For example, if the two devices are close, then the RSSI value may be -047 or something like that. When I move the two devices to be far apart, the AT command will still respond with -047 for many seconds (from 10 to 90 seconds) until it finally updates to represent the weaker signal (for example, -077). When I move it back close, it will also take many seconds (10-90) before the RSSI changes to the stronger signal.

Question 1:
Is there anything I can do to eliminate this lag on the Bluno Nano? I have already tried reflashing the firmware, but the problem persists.

Question 2:
Are there other products that you can suggest that would be more responsive to the RSSI updating? Once I find the right product, I will be buying a bunch for a project I’m working on.

Thank you so much in advance for your help!

2

There does not seem to be any mention of RSSI in the manufacturer’s documentation, though there is the chance that this might work (AT Command sent to the BLE):

  1. “AT+RSSI” Request the RSSI of the BLE (new in BLE firmware 1.6)**
    AT+RSSI=?<CR+LF> Request the RSSI of the BLE(if there is no connection, “-000” will be returned)
    https://www.dfrobot.com/wiki/index.php/Bluno_SKU:DFR0267#Configure_the_BLE_through_AT_command

You might also try this code:
https://www.dfrobot.com/forum/viewtopic.php?f=2&t=1368#p7188

Unfortunately no alternative products to suggest - it’s rather rare in most hobby robotics applications to require the RSSI frequently. Perhaps someone in the community has had the same issue, tried some products and has a suggestion.