How to test one channel Advertising?

[Alan Ajit]

Dear Nordic

how i test one channel advertising?

I change inside advertising_init() 

   ble_gap_adv_params_t m_adv_params;

   m_adv_params.channel_mask[4] =0x60;       // advertising only in channel 39

Is it right way  or anything additional settings needed?

Tested in nrf52832 DK using SDK 15 its advertising but i don't know is this work properly how i know its advertising only in channel 39

can you help me to achieve this?

[Kenneth]

Hello,

Check out:
https://devzone.nordicsemi.com/f/nordic-q-a/11401/advertising-on-a-single-channel-with-s132/42970#42970 

Old thread, but still valid.

Best regards,
Kenneth

[Alan Ajit]

Thanks for replay i see that

based on that i change like above 

everything works fine but i don't know BLE advertising is in one channel 

is it my step above mentioned is right? 

is it any way to test to check the channel of advertising?

can you help me to solve this ?

[Kenneth]

Hello,

The best is if you have access to a spectrum analyzer then you can measure the actual output.

Alternatively if you measure the current consumption, you should also see that the average current consumption drops a bit when using 1 instead of 3 channel.

Best regards,
Kenneth

[Alan Ajit]

Thank you

I tested this with two device one is act as receiver and other is for advertising 

Advertiser Side:-

I change inside advertising_init() 

   ble_gap_adv_params_t m_adv_params;

   m_adv_params.channel_mask[4] =0x60;       // advertising only in channel 39

and also i changed Receiver side:-

static ble_gap_scan_params_t const m_scan_params =
{
.extended = 1,
.active = 1,
.interval = SCAN_INTERVAL,
.window = SCAN_WINDOW,
.timeout = SCAN_DURATION,
.scan_phys = BLE_GAP_PHY_1MBPS,
.filter_policy = BLE_GAP_SCAN_FP_ACCEPT_ALL,
.channel_mask[4] =0x80,    
};

this is for scanning channel 38 and 37 

Here i get the advertising packets in 38 and 37 channel

is it any wrong in my procedure?

set Advertising ---->39 channel

set Scanning----->37 and 38 channel

but i get advertising in 37 and 38 channels

can you help me to solve this issue?

[Kenneth]

Can you init as it is intended by:

m_adv_params.channel_mask.ch_37_off = 1;
m_adv_params.channel_mask.ch_38_off = 1;

Instead of:

m_adv_params.channel_mask[4] =0x60;

[Alan Ajit]

Thank you for reply I am using SDK 15

and i tried to like you said above in advertising_init() but its show error that's why I am using (m_adv_params.channel_mask[4] =0x60;)

but advertising in one channel is not working 

can you help how to implement this in my application?

[Kenneth]

Seems they always change the parameters..

I have now tried ble_app_beacon example, with only one addition in advertising_init():
m_adv_params.channel_mask[4] = 0x60; 

I can confirm it only advertise on channel 39 using an Ellisys Bluetooth sniffer.

Best regards,
Kenneth

[Alan Ajit]

Thank you

I set 39 channel  for Advertising and in scanner 37 and 38 channel for scanning

Modification in Advertiser:-

m_adv_params.channel_mask[4] = 0x60; (for 39 channel)

Modification in Scanner:-

static ble_gap_scan_params_t const m_scan_params =
{
.extended = 1,
.active = 1,
.interval = SCAN_INTERVAL,
.window = SCAN_WINDOW,
.timeout = SCAN_DURATION,
.scan_phys = BLE_GAP_PHY_1MBPS,
.filter_policy = BLE_GAP_SCAN_FP_ACCEPT_ALL,
.channel_mask[4] =0x80,
};

for 37 and 38 channel scanning

but scanner gets Advertising is it any wrong in my procedure?

[Kenneth]

Any difference if using extended = 0? Are you printing out p_adv_report->ch_index?

Best regards,
Kenneth