NRF51822 sensor (S110) reconnection between different APs (S120)

[ldmxhj]

Hi, I am working on a project that the ble sensor will be mobile. I load mutiple nrf51822 with the softdevice S120 working as APs and place them in different places to extend its coverage. I load one nrf51822 with the softdevice S110 acting as the sensor. I expect it will automatically connect to the closest AP when it drops from the prvious AP. However, the sensor will stay in disconnected unless i reset the sensor or the closest AP. Any idea what causes that? Sensor: SDK Softdevice 8.0.0 + ble peripheral UART example AP: SDK softdevice 2.1.0 + ble central uart example

[ldmxhj]

Dear Ole, Thanks a lot for your detailed explanation and help on testing. I am still working on integrating the ble_app_uart_c and ble_app_multilink_central, so that it will handle uart connections from multiple peripherals at the same time. I have tested each example individually and both of them can do the re-connection between different central. However, the problem I am having now is that the program is not able to detect the NUS services after the integration. My code (based on the example) is available here [BLE_APP_MULTIPLE_UART]. (www.dropbox.com/.../nRF51_SDK_10.0.0_20160303.zip . It would be really appreciated if you could point out the problem on the code. Thanks so much for your time and help! Jack