https://devzone.nordicsemi.com/f/nordic-q-a/100817/2-nrf51822-data-transfer-without-having-to-connectHello ! I have a question. I have a nrf51822 acting as ble_central and always receive data with any ble_pheripheral data without scanning connected to the device, when receiving any data ble_central will print the data to uart. For example : Transmitteren-USTelligent Community 13Fri, 16 Jun 2023 02:11:28 GMThttps://devzone.nordicsemi.com/thread/431392?ContentTypeID=1Fri, 16 Jun 2023 02:11:28 GMT137ad170-7792-4731-bb38-c0d22fbe4515:7e23a05b-dccc-4b00-a4bf-33f9786eb461John henrry<p>thanks for the response, can you give me an example of the transmission received?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/431266?ContentTypeID=1Thu, 15 Jun 2023 12:58:32 GMT137ad170-7792-4731-bb38-c0d22fbe4515:84f270eb-d7df-4122-93c5-54e05ac8c86eKenneth<p>Hello,</p> <p>It seems to me that you can for instance use advertisment packets to send data, in the advertisment packet you can add manufacturer specific data, such as &quot;num ...&quot;.</p> <p>The peripheral can be in system off mode, wait for button press, then wakeup and start advertising &quot;num ...&quot; for a period of time before going to sleep and wait for next button press.</p> <p>Kenneth</p><div style="clear:both;"></div>