Establishing Bluetooth Low Energy connections

The nRF Connect Bluetooth® Low Energy app can establish and maintain up to eight simultaneous Bluetooth Low Energy connections.

1. To scan for nearby Bluetooth devices, click the Start scan button in the Discovered devices view.

   The advertising devices start to appear in a list in the Discovered devices view. Each entry in the list shows the name, address, and RSSI of the received advertising packet. For information on how to set up advertising for a device, see Setting up advertising.

   To view the advertising type and data fields of a packet, select the packet entry in the list.

   To sort the list according to signal strength and thus according to which device is closest, click Options and select Sort by signal strength.

2. To establish a Bluetooth connection with a peer device, click the Connect button associated with the device.

Figure 1. Discovered services

When the connection has been established, a new peripheral device appears in the Connection Map, to the right of the local device. The nRF Connect Bluetooth Low Energy app automatically performs an initial service discovery. The discovered services are listed below the connected device. Attributes that are known to the application are shown by their name. Attributes that are unknown to the application are shown by their UUID only. For information on how to add UUID definitions, see Adding UUID definitions.

A line connects the local and remote device signaling that they are connected over Bluetooth. To open a connection info dialog displaying the parameters of the connection, encryption, and bond state, hover the mouse pointer over the padlock icon.

Figure 2. Hovering over the padlock icon