Signal status VALID not working for some devices

[redflo]

Hi, i had the problem, that i could only rarely get MQTT Messages from some devices even if they are really nearby. The Problem is, that these devices only send the messages 2 times (sometimes only one time?), and due to noise i often get only one message with valid checksum. But the "status" is set only to VALID if there are 2 messages in short time. Why? After changing VALID to FIRST in line 104 in RfHandler.cpp i get enough MQTT messages from the device even from a far range.