Multi writes and reads hanging - golang/net pkg - sockets

Question

I am trying to learn Golang (and net pkg). I have written a simple client
and server. Client sends two messages in sequence and reads server msg.
Server reads two messages from a client and sends one message - this hand
shake is hanging. Could you suggest what I am missing? Thanks.
When client combine two messages into one and sends it (so the server reads
only once), this does not hang.
/* ======= Server start ==============================================*/
package main
import (
"fmt"
"net"
"os"
)
func processClients(cfd net.Conn) {
clientMsg := make([]byte, 128)
_, err := cfd.Read(clientMsg) // read client msg
if err != nil {
return
}
clientID := make([]byte, 10)
_, err = cfd.Read(clientID) // read client id
if err != nil {
return
}
clientMsg = append(clientMsg, clientID...) // TBD: handle len boundaries
fmt.Println("Server received msg:", string(clientMsg))
_, err = cfd.Write(clientMsg[0:len(clientMsg)]) // ack client msg
if err != nil {
return
}
}
func initServer() {
lfd, err := net.Listen("unix", "/tmp/unix.socket")
if err != nil {
fmt.Println("net.Listen error", err)
return
}
defer os.Remove("/tmp/unix.socket")
fmt.Println("Listening on /tmp/unix.socket")
for {
fd, err := lfd.Accept()
if err != nil {
fmt.Println("Accept() error", fd)
break
}
go processClients(fd)
}
}
func main() {
initServer()
}
/* ======= Server end ===============================================*/
/* ======= Client Start ===============================================*/
package main
import (
"fmt"
"net"
"sync"
)
var wg sync.WaitGroup
var clientID int
func sendReq() {
fd, err := net.Dial("unix", "/tmp/unix.socket")
if err != nil {
return
}
defer fd.Close()
clientID++
id := fmt.Sprintf("%v", clientID)
_, err = fd.Write([]byte(id)) //send client id
if err != nil {
return
}
_, err = fd.Write([]byte("Hello there, I am client")) // send client msg
if err != nil {
return
}
serverMsg := make([]byte, 128)
_, err = fd.Read(serverMsg) // Read server msg
if err != nil {
return
}
fmt.Println(string(serverMsg))
wg.Done()
}
func main() {
wg.Add(5)
go sendReq()
go sendReq()
go sendReq()
go sendReq()
go sendReq()
wg.Wait()
}
/* ======= Client end ===============================================*/