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

[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

[Elfving]

Hello again!

lgs said:

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

How long it takes sending the advertisements themselves in other words? Advertisement window is not an expression I am familiar with

lgs said:

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

Yes, these are known as channels and refer to different frequencies. 37, 38 and 39 (2402Mhz, 2426Mhz & 2480Mhz) are used for advertising as advertising is bound to happen a lot, and these channels have the least overlap with WiFi. They use multiple channels for redundancy and to allow more traffic.

Regards,

Elfving

[lgs]

Elfving said:

How long it takes sending the advertisements themselves in other words? Advertisement window is not an expression I am familiar with

Precisely, the time is spent on sending advertisements.