How to broadcasting to all peripherals in the S120 multiplink example

[ldmxhj]

Hi, I am modify the S120 multi-link UART example code (code is available here), and just noticed a problem that the central is only able to send the UART data to the last connected peripheral. How can I make the central to broadcast the UART data to all the connected peripherals? Thanks a lot for your help, jack

[ldmxhj]

The above code is based on SDK8. I also tried with the SDK11 ble_app_uart_c example, I have changed the CENTRAL_LINK_COUNT number to 2 and the associated RAM setting. However, I still can only get one device connect each time. Any idea why is that? I am looking for an example that is able to do the UART for multiple peripherals (broadcasting downstream). Thanks

[FormerMember]

From what I can see, ble_app_uart_c is not implemented to work properly with more than one peripheral device. In order to make it work with more than one peripheral, you will have to modify the example so that it can keep track of more than one peripheral device; the example ble_app_multilink_central shows how to do that. m_ble_nus_c in ble_app_uart, corresponds to m_ble_lbs_c in ble_app_multilink_central.

[ldmxhj]

Hi Kristin, Thank you so much for your reply and help. However, the problem still exists. When I sent a data from the central, only the last connected peripheral will receive the data. How can I keep tracking all the handle and sending to them one by one?

[FormerMember]

As you can see in ble_app_multilink_central, m_ble_lbs_c is an array containing handles for all of the connected devices. And then, when you want to transmit data, you have to select the correct handle for the transmission, or choose to loop through all of the devices.

[ldmxhj]

nRF5_SDK11_changed.rar Hi Kristin, yes, I have changed the main.c file as you suggested. Please see the attached file. The connection with multiple peripherals looks fine to me. I am also able to see the debug handle message on the uart. However, I couldn't receive or transmit any data through uart.