How to implement Bluetooth transmission in golang

Golang is an efficient, fast and powerful programming language that provides great support in writing web applications and interactive applications. In the field of Bluetooth transmission, golang also has excellent performance. In this article, we will introduce how to use golang to implement Bluetooth transmission.

Before starting this article, we need to understand some basic knowledge of Bluetooth transmission. Bluetooth is a short-range wireless communication technology commonly used to connect devices such as wireless headsets, keyboards, and mice. It can transmit data without the use of cables, and its typical range is around 10 meters.

To implement Bluetooth transmission, you need to use golang’s bluetooth library. This library provides functionality to communicate with Bluetooth devices.

First, we need to install a Bluetooth-enabled adapter on our computer so that our code can access and communicate with the Bluetooth device. After installing the adapter, we can install golang's bluetooth library.

Enter the following command in the command line window to install:

go get github.com/karalabe/gousb
go get github.com/raff/goble

After the installation is completed, we need to import the bluetooth library in the code:

import "github.com/currantlabs/ble"

Next, we can Use the following code to scan for available Bluetooth devices:

// Set up BLE scanner
scanner, err := ble.NewScanner()
if err != nil {
    log.Fatalf("Failed to initialize BLE scanner: %s", err)
}
defer scanner.Close()

// Start scanning for 10 seconds
stopScan := make(chan struct{})
go func() {
    <-time.After(10 * time.Second)
    close(stopScan)
}()
devices := make(map[string]struct{})
scanner.Handler = ble.AdvertisementHandler(func(a ble.Advertisement) {
    devices[a.String()] = struct{}{}
})
if err := scanner.Scan(stopScan); err != nil {
    log.Fatalf("Failed to scan for devices: %s", err)
}
for device := range devices {
    log.Printf("Discovered device %s", device)
}

The above code will scan for 10 seconds and store the discovered devices in map[string]struct{}. We may further process this information if necessary.

We can also use the following code to connect to a Bluetooth device:

targetMAC, err := ble.ParseMAC(targetAddr)
if err != nil {
    log.Fatalf("Failed to parse target MAC address %s: %s", targetAddr, err)
}
client, err := ble.NewClient(&ble.ClientParams{
    ConnectionParams: ble.ConnectionParams{
        Interval:         50 * time.Millisecond,
        Latency:          4,
        SupervisionTimeout: time.Second,
    },
    AutoConnect: true,
})
if err != nil {
    log.Fatalf("Failed to initialize BLE client: %s", err)
}
defer client.CancelConnection()
ctx := context.Background()
peripheral, err := client.Dial(ctx, targetMAC)
if err != nil {
    log.Fatalf("Failed to connect to peripheral: %s", err)
}
defer peripheral.CancelConnection()

The above code will connect to the target device and cancel as soon as the connection is completed. We can also stay connected after connecting and send and receive data. Here is an example:

for {
    peripheral := connect()
    if peripheral == nil {
        continue
    }
    if err := peripheral.WriteCharacteristic(characteristic, data, true); err != nil {
        log.Printf("Failed to send data: %s", err)
    }
    if err := peripheral.SetNotifyValue(characteristic, func(b []byte) {
        log.Printf("Received data: %v", b)
    }); err != nil {
        log.Printf("Failed to set notification: %s", err)
    }
    <-time.After(10 * time.Second)
}

The above code will connect to the target device, send data and get data. It will also disconnect after 10 seconds and wait some time before reconnecting. You can modify the code as needed and implement other actions based on this example.

Summary:

In this article, we introduced how to use golang’s bluetooth library to implement Bluetooth transmission. We learned about basic Bluetooth transmission knowledge and learned how to scan for devices, connect to devices, send data, and receive data. Golang's bluetooth library provides extensive support, making implementing Bluetooth transmission simple and easy. If you are interested, try this technology in your next golang project!

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