fix bug when connection is interrupted on the hw connection

+ stop listening for 10 seconds after an error

router.py

@@ -168,6 +168,9 @@ class Router(IoHandler):
         except Exception as e:
             msg = f'error in request: {e!r}'
             self.service.failures[self.service.port] = msg
+            Service.deadline = time.time() + 10
+            Service.reopen.append(self.service)
+            self.service.close()
             log.error(msg)
         self.close()
 
@@ -345,6 +348,8 @@ class Service:
     failures = {}
     firewall_ports = set()
     tmo = 5
+    reopen = []
+    deadline = None
 
     def __init__(self, port, addr, iocls, maxcount=None, handler_args=()):
         self.handlers = {}
@@ -399,6 +404,21 @@ class Service:
             self.failures.pop(self.port, None)
             self.handlers[handler.fno] = handler
 
+    def close(self):
+        s = self.socket
+        self.readers.pop(s.fileno(), None)
+        s.close()
+
+    def clone(self):
+        return type(self)(self.port, self.addr, self.iocls)
+
+    @classmethod
+    def check_deadline(cls):
+        if cls.deadline and time.time() > cls.deadline:
+            cls.deadline = None
+            while cls.reopen:
+                cls.reopen.pop().clone()
+
     @classmethod
     def run(cls, routes):
         firewall = routes.pop('firewall', None)
@@ -433,7 +453,8 @@ class Service:
                         if ready:
                             break
                 else:
-                    ready, complete, _ = select(cls.readers, [], [])
+                    ready, complete, _ = select(cls.readers, [], [], 1)
+                cls.check_deadline()
                 # log.debug('ready %r', ready)
             except Exception as e:
                 for fno in cls.readers:
@@ -448,7 +469,7 @@ class Service:
                         log.error('%r in select([],[%d])', e, fno)
                 raise
             for fno in ready:
-                cls.readers[fno]()
+                cls.readers.get(fno, int)()  # int() -> dummy function
 
 
 if __name__ == '__main__':