How to change data channels ch_map for mesh ?

[swap007]

Hello, I want to change data channels after provisioning, I follow devzone.nordicsemi.com/.../ here.

To set,

          memset(&new_opt_config, 0, sizeof(new_opt_config));

          new_opt_config.gap_opt.ch_map.ch_map[4] = 0x1F; 
          new_opt_config.gap_opt.ch_map.ch_map[0] = 0xFF;
          new_opt_config.gap_opt.ch_map.ch_map[1] = 0x0F;
          new_opt_config.gap_opt.ch_map.ch_map[2] = 0xFF;
          new_opt_config.gap_opt.ch_map.ch_map[3] = 0x00;
          status = sd_ble_opt_set(BLE_GAP_OPT_CH_MAP,&new_opt_config);

& I received status : NRF_SUCCESS

//To get config > memset(&rcvd_config, 0, sizeof(rcvd_config)); status = sd_ble_opt_get(BLE_GAP_OPT_CH_MAP,&rcvd_config);

& received status :BLE_ERROR_INVALID_CONN_HANDLE, which pointed me to conn_handle.

Que. data channel change is it allow in mesh if yes, What should be opt.gap_opt.ch_map.conn_handle for mesh 1.0.0? (without ) Thanks !

[Rune Holmgren]

Hi,

The channel map of the SoftDevice is intended to be used with conventional BLE connections. You should not call the SoftDevice directly to configure mesh specific features. Instead, use scanner_config_channels_set() in scanner.h and change NRF_MESH_ADV_CHAN_DEFAULT.

Best regards,
Rune Holmgren

[swap007]

Hi Holmgren,

Thank you for your reply. I tried to change #define NRF_MESH_ADV_CHAN_ALL {37} in scanner.h but it seems like, it is taking more than usual time for provisioning & sometimes it is not provisioning at all ?

What am i missing there ?

Thank you 

[Rune Holmgren]

Hi,

It looks like you have changed the channels for advertising, but left the channels for scanning unchanged. This will cause 2/3 of packages to be impossible for the scanner to receive which explains the performance loss you are seeing.

I should have mentioned it in my last message, but you also need to change SCANNER_CHANNELS_DEFAULT to reflect any changes you make to the advertising.

Best regards,
Rune Holmgren