@RestController
public class MyController {

    @Autowired
    MyService service;

    @GetMapping(value = "/{serialNumber}/radio")
    public @ResponseBody Radio getRadio(@PathVariable String serialNumber) {
        // Get Radio for SN
        return service.getRadio(serialNumber);
    }

    @PostMapping(value = "/{serialNumber}/radio")
    public @ResponseBody void createRadio(@PathVariable String serialNumbe) {
        // Create Radio for SN
        service.setRadio(serialNumber, true);
    }

    @PutMapping(value = "/{serialNumber}/radio")
    public @ResponseBody void updateRadio(@PathVariable String serialNumber) {
        // Update Radio for SN
        service.setRadio(serialNumber, false);
    }

}