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Time of the advertisement and scan

lgs

Hi Team,

I have a few questions about the transceive process of BLE Mesh5.0 based on nRF52840 chips.

1. Can they do advertisement and scan operations simultaneously?

2. I know the advertisement interval, but I don't know how long the advertisement process lasts?

3. What's the difference between scan interval and can window?

With best  regards,

Gaosheng

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  • 0 in reply to lgs

    Hello Gaosheng!

    1. Can they do advertisement and scan operations simultaneously?

    No, which is why they send messages rather infrequently. You can read more about this in section 3.7.4.1. A node should send less than 100 messages in a moving 10-second window, so the message rate is ~10Hz.

    2. I know the advertisement interval, but I don't know how long the advertisement process lasts?

    I am a little uncertain about what you are referring to here. The node only advertise when it has something to advertise - either data to send, relay or re-transmit.

    3. What's the difference between scan interval and can window?

    Here you can see the relationship between advertising packets and scan window and interval:

    Regards,

    Elfving

  • 0 in reply to Elfving

    Hi Elfving,

    1. I mean the advertisement window.  Have the advertisement interval likewise? 

    Elfving said:
    I am a little uncertain about what you are referring to here. The node only advertise when it has something to advertise - either data to send, relay or re-transmit.

    2.  Is the alternating appear between advertisement and listening?

  • 0 in reply to Elfving
    Elfving said:
    No, which is why they send messages rather infrequently. You can read more about this in section 3.7.4.1. A node should send less than 100 messages in a moving 10-second window, so the message rate is ~10Hz.

    Hi Elfving,

    Could you provide which doc you are referenced?

    Best regards,

    Gaosheng

  • 0 in reply to lgs

    Hello,

    lgs said:
    Could you provide which doc you are referenced?

    Yeah I was referring to Mesh Profile 1.0.1, you can find it here.

    lgs said:
    1. I mean the advertisement window.  Have the advertisement interval likewise? 

    I am not sure if I understand. Are you wondering about the length of advertisement window?

    lgs said:
    2.  Is the alternating appear between advertisement and listening?

    Again I am not completely sure what you are asking, but it does alternate between advertisement and listening. Do you want me to explain the illustration that describes these differences further?

    Regards,

    Elfving

  • 0 in reply to Elfving
    Elfving said:
    I am not sure if I understand. Are you wondering about the length of advertisement window?

    Hi Elfving,

    1. Yes I want to know the length of the advertisement window. I want to know how long it will take.

    2. Why set the CHANNEL_NUM more than one? is it not enough with one channel? are the channels meaning the different frequencies?

    With best regards,

    Gaosheng

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