Documentation of SNR/RSSI stats?

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Viewing 8 posts - 1 through 8 (of 8 total)
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  • November 4, 2015 at 8:48 pm #9802
    Jon Ross
    Participant

    I’m building a app to use as a useful range tester. I’m trying to send data to a gateway, have the gateway send the rssi back, and then display stats on rssi and snr etc…
    I’ve been playing with the getRssiStats() and getSnrStats() functions. When I’m using ping(), the SNR seems to be completely different in the returned structure than the SNR reported by getSnrStats().
    Is there any documentation (e.g units and calculations) for the various functions, and what they correspond to on the semtech radio?

    November 4, 2015 at 9:02 pm #9803
    Jason Reiss
    Keymaster

    The ping rssi and snr are the values received by the gateway. We will update mdot.h to document.

    AT+PING uses that function and is documented here.
    http://www.multitech.com/manuals/s000612_8.pdf

    November 5, 2015 at 4:56 pm #9812
    Jon Ross
    Participant

    What is the payload size when using ping(), and is there a way to change it? I’m assuming it’s going to be pretty small by default. I’m trying to test real-world payloads of e.g. 48 bytes to assess range, so I probably need to develop my own ping function that sends larger packets. Is there documentation for the server part of the ping that sends back the rssi and snr of the received packet?
    Thanks!

    November 6, 2015 at 8:19 am #9814
    Brandon Bayer
    Blocked

    Jon,

    Ping’s payload size is 0.

    -Brandon

    November 24, 2015 at 10:26 am #10117
    Mark Stanley
    Participant

    Please can you give an example of how to use getRssiStats? I am sure I’m doing something wrong/daft as the 4 values all come back zero.

    Thanks

    November 25, 2015 at 9:42 am #10135
    Brandon Bayer
    Blocked

    Hey Mark,

    If you are getting 4 values back, then you are using it correctly. They will all be zero until you do an OTA join or, if doing manual join, until the mDot receives a packet from the server.

    -Brandon

    January 14, 2016 at 10:31 am #11049
    Anthony Huy
    Participant

    On the Conduit side, the RSSI bounces all over the place but only in two regions. I get values from -80 to -90 or else -24 to -29. Any ideas why this is so different? This is btw when I send 8 straight messages…..

    January 14, 2016 at 10:43 am #11050
    Jason Reiss
    Keymaster

    Do you see consistency with the “rfch” value to each set of values?

    There are two radios each setup to listen on 4 frequencies.
    The node will randomly choose a frequency out of the eight.

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