sending signal from AEP GW to mDot

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  • December 7, 2016 at 10:28 am #15933
    Micheal Le
    Participant

    Hi,

    Is it possible to program somehow the AEP gateway to send signal back to my mDot?

    So, I currently have connection between mDot and the gateway. Gateway reads mDot’s rssi and etc and I am trying to send this rssi information that are received at gateway from mDot, then back to mDot

    Is it possible to do so?

    Thanks

    • This topic was modified 8 years, 4 months ago by Micheal Le.
    December 7, 2016 at 3:40 pm #15939
    Leon Lindenfelser
    Moderator

    Hi Micheal,

    In Node RED on the Conduit AEP, you can add a function node between the LoRa input and output node with the following code.
    msg.payload=msg.lsnr + msg.rssi;
    return msg;

    See this link.

    Conduit mPower: LoRa Communication and Node-RED

    Kind regards,
    Leon

    December 8, 2016 at 2:15 pm #15977
    Micheal Le
    Participant

    Hi Leon,

    Thank you for the information.

    then how do I check the packet received on mDot?

    Thanks

    Regards,

    December 8, 2016 at 2:51 pm #15979
    Leon Lindenfelser
    Moderator

    Hi Micheal,

    Are you asking how to receive the packet or how to parse the data? If received, the packet will arrive in the first or second receive window… assuming you are using class A.

    Kind regards,
    Leon

    December 8, 2016 at 2:58 pm #15980
    Micheal Le
    Participant

    Hi Leon,

    I am asking how to check whether messages has been sent back to the mDot or not from the gateway. When you mean by receive window, are you referring to the debugging window on nodeRed?

    And also, how do we parse data thoes data?

    Thank you!

    • This reply was modified 8 years, 4 months ago by Micheal Le.
    • This reply was modified 8 years, 4 months ago by Micheal Le.
    December 8, 2016 at 3:08 pm #15984
    Leon Lindenfelser
    Moderator

    Hi Micheal,

    The nature of LoRa communication is such that there is no guarantee that a down link or up link packet will be received on the other side. You can enable acknowledgements and link checks improve odds of delivery but at a cost. Reading the following link may help shed light on the matter.

    Introduction to LoRa

    The receive window I am talking about is the window that is used by the mDot to receive down link packets from the network server following an up link.

    Kind regards,
    Leon

    December 9, 2016 at 1:01 pm #15996
    Micheal Le
    Participant

    Hi Leon,

    so when I put a function between lora input and output with following script,
    msg.payload=msg.lsnr + msg.rssi;
    return msg;

    What would be the output node in order for a mDot to receive those data?

    Thanks again

    December 9, 2016 at 1:11 pm #15997
    Leon Lindenfelser
    Moderator

    Hi Micheal,

    In the flow on this page

    Conduit mPower: LoRa Communication and Node-RED


    you see a LoRa input node and LoRa ouput node. The function node should be placed in between them.

    Leon

    December 9, 2016 at 2:12 pm #15999
    Micheal Le
    Participant

    Hi Leon,

    Yes I see them, but what do I need to choose for the output in order for my mDot to receive data? Sorry, I am quite novice to nodeRed.

    Thanks

    December 9, 2016 at 2:22 pm #16000
    Leon Lindenfelser
    Moderator

    Micheal,

    I think you are expecting this to be more complicated than it is. In the Conduit node red screen, there is a list of input, output, function etc nodes in the left panel. From the input list, grab lora. From the function list, grab function. From the output list, grab lora. Connect as follows.
    lora input———–function———-lora output
    Double click the function node to insert code. Deploy it with the Deploy button in the upper right. Join the Conduit from the dot and do an AT+SEND=. See what you get back.

    Leon

    December 9, 2016 at 2:41 pm #16002
    Micheal Le
    Participant

    Thank you Leon.

    Is there anyway we can parse out those data that are received from gateway?? I am using mbed lib. to work with mDot.

    I can see number of bytes are received, but not the actual value(rssi, lsnr)

    Thank you again

    December 9, 2016 at 4:56 pm #16007
    Leon Lindenfelser
    Moderator

    Hi Micheal,

    With what I gave you, the data is probably ASCII formatted. I believe you can change the formatting of the data in the function node before sending it. Like set it to hex if that’s what you are looking for.

    Leon

    December 12, 2016 at 12:37 pm #16020
    Micheal Le
    Participant

    Hi Leon,

    I literally just see following view on serial monitor for mDot,
    [INFO] successfully sent data to gateway
    [INFO] Packet Received: 1 Bytes SeqNo: 10719

    Is this something I have to work on mDot or on nodeRed?

    Thanks

    December 13, 2016 at 9:54 am #16029
    Leon Lindenfelser
    Moderator

    Hi Micheal,

    Assuming you are using our AT command code, the payload of the down link packet will be output on the main serial port… not the debug port.

    I’m not sure if this might work for you but in our AT command code, the +PING command displays the RSSI and SNR that the gateway sees from the mDot in up link packets. The +RSSI and +SNR commands display the RSSI and SNR as seen in down link packets.

    Leon

    December 13, 2016 at 11:09 am #16032
    Micheal Le
    Participant

    Hi Leon,

    I don’t have the serial connect so I cannot use AT commands at this moment.

    As I mentioned above, I am currently using mbed libraries to work with mDot.

    Is it possible to do with mbed libraries?

    Michael

    December 13, 2016 at 2:12 pm #16040
    Leon Lindenfelser
    Moderator

    Hi Micheal,

    Assuming you are using class A mode, call recv() after send(). See the mDot.h api.

    Leon

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