func onPeriphConnected(p gatt.Peripheral, err error) { fmt.Println("Connected") defer p.Device().CancelConnection(p) if err := p.SetMTU(500); err != nil { fmt.Printf("Failed to set MTU, err: %s\n", err) return } // Discovery services ss, err := p.DiscoverServices(nil) if err != nil { fmt.Printf("Failed to discover services, err: %s\n", err) return } for _, s := range ss { msg := "Service: " + s.UUID().String() if len(s.Name()) > 0 { msg += " (" + s.Name() + ")" } fmt.Println(msg) // Discovery characteristics cs, err := p.DiscoverCharacteristics(nil, s) if err != nil { fmt.Printf("Failed to discover characteristics, err: %s\n", err) continue } for _, c := range cs { msg := " Characteristic " + c.UUID().String() if len(c.Name()) > 0 { msg += " (" + c.Name() + ")" } msg += "\n properties " + c.Properties().String() fmt.Println(msg) // Read the characteristic, if possible. if (c.Properties() & gatt.CharRead) != 0 { b, err := p.ReadLongCharacteristic(c) if err != nil { fmt.Printf("Failed to read characteristic, err: %s\n", err) continue } fmt.Printf(" value %x | %q\n", b, b) } // Discovery descriptors ds, err := p.DiscoverDescriptors(nil, c) if err != nil { fmt.Printf("Failed to discover descriptors, err: %s\n", err) continue } for _, d := range ds { msg := " Descriptor " + d.UUID().String() if len(d.Name()) > 0 { msg += " (" + d.Name() + ")" } fmt.Println(msg) // Read descriptor (could fail, if it's not readable) b, err := p.ReadDescriptor(d) if err != nil { fmt.Printf("Failed to read descriptor, err: %s\n", err) continue } fmt.Printf(" value %x | %q\n", b, b) } } fmt.Println() } }