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This is not entirely complete (some errors are not handled properly) but it's a start.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,129 @@ | ||
| package main | ||
|
|
||
| // This example implements a NUS (Nordic UART Service) client. See nusserver for | ||
| // details. | ||
|
|
||
| import ( | ||
| "github.com/tinygo-org/bluetooth" | ||
| "github.com/tinygo-org/bluetooth/rawterm" | ||
| ) | ||
|
|
||
| var ( | ||
| serviceUUID = bluetooth.NewUUID([16]byte{0x6E, 0x40, 0x00, 0x01, 0xB5, 0xA3, 0xF3, 0x93, 0xE0, 0xA9, 0xE5, 0x0E, 0x24, 0xDC, 0xCA, 0x9E}) | ||
| rxUUID = bluetooth.NewUUID([16]byte{0x6E, 0x40, 0x00, 0x02, 0xB5, 0xA3, 0xF3, 0x93, 0xE0, 0xA9, 0xE5, 0x0E, 0x24, 0xDC, 0xCA, 0x9E}) | ||
| txUUID = bluetooth.NewUUID([16]byte{0x6E, 0x40, 0x00, 0x03, 0xB5, 0xA3, 0xF3, 0x93, 0xE0, 0xA9, 0xE5, 0x0E, 0x24, 0xDC, 0xCA, 0x9E}) | ||
| ) | ||
|
|
||
| var adapter = bluetooth.DefaultAdapter | ||
|
|
||
| func main() { | ||
| // Enable BLE interface. | ||
| err := adapter.Enable() | ||
| if err != nil { | ||
| println("could not enable the BLE stack:", err.Error()) | ||
| return | ||
| } | ||
|
|
||
| // The address to connect to. Set during scanning and read afterwards. | ||
| var foundDevice bluetooth.ScanResult | ||
|
|
||
| // Scan for NUS peripheral. | ||
| println("Scanning...") | ||
| err = adapter.Scan(func(adapter *bluetooth.Adapter, result bluetooth.ScanResult) { | ||
| if !result.AdvertisementPayload.HasServiceUUID(serviceUUID) { | ||
| return | ||
| } | ||
| foundDevice = result | ||
|
|
||
| // Stop the scan. | ||
| err := adapter.StopScan() | ||
| if err != nil { | ||
| // Unlikely, but we can't recover from this. | ||
| println("failed to stop the scan:", err.Error()) | ||
| } | ||
| }) | ||
| if err != nil { | ||
| println("could not start a scan:", err.Error()) | ||
| return | ||
| } | ||
|
|
||
| // Found a device: print this event. | ||
| if name := foundDevice.LocalName(); name == "" { | ||
| print("Connecting to ", foundDevice.Address.String(), "...") | ||
| println() | ||
| } else { | ||
| print("Connecting to ", name, " (", foundDevice.Address.String(), ")...") | ||
| println() | ||
| } | ||
|
|
||
| // Found a NUS peripheral. Connect to it. | ||
| device, err := adapter.Connect(foundDevice.Address, bluetooth.ConnectionParams{}) | ||
| if err != nil { | ||
| println("Failed to connect:", err.Error()) | ||
| return | ||
| } | ||
|
|
||
| // Connected. Look up the Nordic UART Service. | ||
| println("Discovering service...") | ||
| services, err := device.DiscoverServices([]bluetooth.UUID{serviceUUID}) | ||
| if err != nil { | ||
| println("Failed to discover the Nordic UART Service:", err.Error()) | ||
| return | ||
| } | ||
| service := services[0] | ||
|
|
||
| // Get the two characteristics present in this service. | ||
| chars, err := service.DiscoverCharacteristics([]bluetooth.UUID{rxUUID, txUUID}) | ||
| if err != nil { | ||
| println("Failed to discover RX and TX characteristics:", err.Error()) | ||
| return | ||
| } | ||
| rx := chars[0] | ||
| tx := chars[1] | ||
|
|
||
| // Enable notifications to receive incoming data. | ||
| err = tx.EnableNotifications(func(value []byte) { | ||
| for _, c := range value { | ||
| rawterm.Putchar(c) | ||
| } | ||
| }) | ||
| if err != nil { | ||
| println("Failed to enable TX notifications:", err.Error()) | ||
| return | ||
| } | ||
|
|
||
| println("Connected. Exit console using Ctrl-X.") | ||
| rawterm.Configure() | ||
| defer rawterm.Restore() | ||
| var line []byte | ||
| for { | ||
| ch := rawterm.Getchar() | ||
| line = append(line, ch) | ||
|
|
||
| // Send the current line to the central. | ||
| if ch == '\x18' { | ||
| // The user pressed Ctrl-X, exit the program. | ||
| break | ||
| } else if ch == '\n' { | ||
| sendbuf := line // copy buffer | ||
| // Reset the slice while keeping the buffer in place. | ||
| line = line[:0] | ||
|
|
||
| // Send the sendbuf after breaking it up in pieces. | ||
| for len(sendbuf) != 0 { | ||
| // Chop off up to 20 bytes from the sendbuf. | ||
| partlen := 20 | ||
| if len(sendbuf) < 20 { | ||
| partlen = len(sendbuf) | ||
| } | ||
| part := sendbuf[:partlen] | ||
| sendbuf = sendbuf[partlen:] | ||
| // This performs a "write command" aka "write without response". | ||
| _, err := rx.WriteWithoutResponse(part) | ||
| if err != nil { | ||
| println("could not send:", err.Error()) | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } |
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