conf

configuration := `# DEVICES
UT0311-L0x.405419896.name = BOARD1
UT0311-L0x.405419896.address = 192.168.1.100:60000
UT0311-L0x.54321.name = BOARD2
UT0311-L0x.54321.address = 192.168.1.101:60000
`

config := struct {
	Devices deviceMap `conf:"/UT0311-L0x\\.([0-9]+)\\.(\\w+)/"`
}{}

err := Unmarshal([]byte(configuration), &config)
if err != nil {
	fmt.Printf("ERROR: %v", err)
	return
}

for id, d := range config.Devices {
	fmt.Printf("DEVICE: %-10d %s\n", id, d)
}

Output:

DEVICE: 405419896  BOARD1  192.168.1.100:60000
DEVICE: 54321      BOARD2  192.168.1.101:60000