Should be this format:
http://192.168.86.47:9876/send?deviceMac=34ea34e7aaaa&codeId=31
so remove the : in the MAC address and check that port number. RM Plugin usually defaults to 9876 unless you specifically set it to 80.
That's in the RM Plugin app if you scroll down. (Are you using the two apps: E Control and RM Plugin?). I will post instructions with screenshots from start to end in next Post hopefully it is helpful.
