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

[Elfving]

Hello,

I will have to get back to you on this.

Regards,

Elfving

[lgs]

I hope you can solve the case ASAP

[Elfving]

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

[lgs]

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?

[lgs]

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

[Elfving]

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

[lgs]

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

[lgs]

Elfving said:

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

Hi Elfving,

Could you explain more about the diagram?

With best regards,

Gaosheng