code: def connect(self, addr):
          '''
          Call adb connect
          Return true when connect success
          '''
          if addr.find(':') == -1:
              addr += ':5555'
          output = self.run_cmd('connect', addr)
          return 'unable to connect' not in outpuf connect(self, addr):
          '''
          Call adb connect
          Return true when connect success
          '''
          if addr.find(':') == -1:
              addr += ':5555'
          output = self.run_cmd('connect', addr)
          return 'unable to connect' not in output
docs: Call adb connect
          Return true when connect success