Is there an eval program to view/record RSSI?

[EdT]

I am in the process of evaluating the NRF52840dk and the NRF52840 dongle. I would like to have a program that will show, or record, RSSI data between units, or a unit and, say, a cell phone. Is there any simple way to do that without having to write a lot of code? I'm just trying to do a quick evaluation at this point, and I suspect the code is already available, or something that covers that need for evaluation.

[EdT]

Thanks. I loaded the RSSI monitor onto both the dk and the dongle. When I run it, in both cases, it shows me a graph with all of the channels in the 2.4 GHz band with blue and green signal strength indicators. So far, so good. But, I don't know what they are really measuring. I suspect it is everything in the environment, which would include cordless phones, Android phones with wifi and bluetooth, and the local wifi. I would like to be able to measure range vs RSSI to a single device. What is the trick for doing that? When I first got the kit, I did load the heart rate monitor and ran it and I could see the graph on my Android, but what exactly should I do to get range vs RSSI values using the dk and/or the dongle?

[mpwirwin]

You can only use one device to monitor the RSSI of the other. For example program the HRS app onto the DK and use the dongle on the RSSI Viewer app. You should see the RSSI number for the DK running the HRS service. If you move the DK closer to the dongle then the number will be bigger. 

An easier way would be to run the nRF Connect app on your phone or LightBlue both of these give you RSSI measurements. With your phone next to the DK the RSSI might be as high as -30dbm and when you walk away from the DK it will drop. RSSI is a measure of signal strength which is effected by the transmit power and antenna efficiency on both devices which can be directional depending on the environment. RSSI gives you a rough estimate of closeness it is not an accurate representation of distance because it can be affected by the environment. If you had two devices it can tell you which one you're closer to but not there distance. 

[EdT]

What is HRS and where do I download it to load onto the dk or dongle?

[EdT]

OK, I gather that the heart rate monitor and HRS are the same thing. So, now I have loaded the HRS into the DK and I am running it off the battery. I am not sure if it is running continuously, but I think it might be. The number 1 LED flashes for a bunch of times, and then it goes into a steady light, then begins flashing again. Is this working continuously?

The next question regards the measurement of RSSI. When I start the RSSI viewer, I get a graph with 24 bars, most blue, some green. A lot of them are moving around, I assume because of the wifi and cordless phones that are in the area. Is this correct? How do I tell which channel is the dongle with the heart rate monitor running? I think it might be channel 1, which is one of the green channels, but I am not sure. Is it transmitting all of the time, or only when the green LED1 is constant or flashing?

Finally, how do you properly remove the battery without damaging anything?

[Martin Lesund]

Please check the Heart Rate Application Documentation.
Looking at the log output will also help you out in how this is working. 
Here is some extra info about the RSSI viewer