nRF UART service with multiple peripherals

RE: nRF UART service with multiple peripherals

djqtsg — Mon, 15 May 2017 09:08:41 GMT

By following the post link text, I have made it partially work.

Now the central node can have two connections to peripheral nodes and even able to receive from the two P nodes.

RE: nRF UART service with multiple peripherals

djqtsg — Fri, 05 May 2017 09:41:48 GMT

my code have DLE feature:

	//Configure the memory pools available for application packets
	ble_conn_bw_counts_t conn_bw_counts = {
			.tx_counts = {.high_count = 1, .mid_count = 0, .low_count = 0},
			.rx_counts = {.high_count = 1, .mid_count = 0, .low_count = 0}
	};
		
	//Configure conn_bw_counts in enable_params (along with others) 
	ble_enable_params.common_enable_params.p_conn_bw_counts = &conn_bw_counts;
	ble_enable_params.common_enable_params.vs_uuid_count = 1;
	ble_enable_params.gatts_enable_params.attr_tab_size = BLE_GATTS_ATTR_TAB_SIZE_DEFAULT;
	ble_enable_params.gatts_enable_params.service_changed = 0;
	ble_enable_params.gap_enable_params.periph_conn_count = PERIPHERAL_LINK_COUNT; //PERIPHERAL_LINK_COUNT   0   < Number of peripheral links used by the application. When changing this number remember to adjust the RAM settings
	ble_enable_params.gap_enable_params.central_conn_count = CENTRAL_LINK_COUNT; //CENTRAL_LINK_COUNT      1  < Number of central links used by the application. When changing this number remember to adjust the RAM settings
	ble_enable_params.gap_enable_params.central_sec_count = 1;

I will try to modify the original UART code and see what happens. Thx.

RE: nRF UART service with multiple peripherals

Jørgen Holmefjord — Fri, 05 May 2017 09:26:33 GMT

You should not get 0x07 only by increasing the CENTRAL_LINK_COUNT define. This should give a 0x04 NO_MEM error, if you have not changed the RAM settings to make room for the increased softdevice RAM usage. Have you made any other changes to the code?

This answer shows how to add support for multiple peripherals in the UART central example. It does not provide a complete example, but it is a good starting point to get it up and running.

Best regards,

Jørgen

RE: nRF UART service with multiple peripherals

djqtsg — Fri, 05 May 2017 09:04:19 GMT

I want a central able to talk to multiple peripheral.

That link you gave leads to a dual peripheral application.

RE: nRF UART service with multiple peripherals

Jørgen Holmefjord — Fri, 05 May 2017 08:44:39 GMT

I'm sorry, I might have misunderstood your initial question. Which example exactly are you using? Are you creating a central which can connect to multiple peripherals, or do you want a peripheral that can connect to multiple centrals?

RE: nRF UART service with multiple peripherals

djqtsg — Fri, 05 May 2017 08:06:25 GMT

I am using SDK 12.0.0, SoftDevice version is S132.

The error code is 0x07, Invalid Parameter.

RE: nRF UART service with multiple peripherals

Jørgen Holmefjord — Fri, 05 May 2017 07:37:48 GMT

Which SDK and Softdevice versions are you using?
What error do you get when setting "central link count > 1"?

You might have to change the RAM settings to allow higher link count. This answer contains an example of how to add dual peripheral feature to the UART example (it's based on alpha softdevice and SDK, but you should be able to see what changes have been made.