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server.go
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server.go
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package main
import (
"log"
"fmt"
"bytes"
"golang.org/x/sys/unix"
)
func main() {
// Open a bluetooth stream socket using RFCOMM
fd, err := unix.Socket(unix.AF_BLUETOOTH, unix.SOCK_STREAM, unix.BTPROTO_RFCOMM)
if err != nil {
log.Fatalf("Can't open a bluetooth socket: %v\n", err)
}
// Bind it to the local address
err = unix.Bind(fd, &unix.SockaddrRFCOMM{Channel: 1, Addr: [6]uint8{0, 0, 0, 0, 0, 0}})
if err != nil {
log.Fatalf("Can't bind: %v\n", err)
}
// Change socket mode to "listening"
err = unix.Listen(fd, 1)
if err != nil {
log.Fatalf("Can't start listening to a socket: %v\n", err)
}
// Prevent server from exiting by creating a goroutine that never closes
finished := make(chan bool)
go runServer(fd)
<- finished
}
// 4Kb is a maximum msg length
const MAX_MSG_SIZE = 4 * 1024
func runServer(fd int) {
// Start accepting messages
nfd, _, err := unix.Accept(fd)
if err != nil {
log.Fatalf("Can't start accept connection: %v\n", err)
}
// Create an accumulator buffer
acc := make([]byte, MAX_MSG_SIZE)
for {
// Temporary message buffer size
buffer := make([]byte, 1024)
// Read message to buffer
_, err := unix.Read(nfd, buffer)
if err != nil {
log.Fatal(err)
}
// Add buffer to accumulator as we might not receive the full message yet
acc = append(acc, buffer...)
// If we received terminating bytes, show the message and clean the accumulator
if bytes.Contains(buffer, []byte{13, 10}) {
fmt.Println("Finished message: ", string(acc))
acc = make([]byte, MAX_MSG_SIZE)
}
}
}