Understanding the Serial Monitor?

[Terence Faul]

Hi

These are messages received at my gateway by a temp/hum/door node powered y battery.

299665 TSF:MSG:READ,1-1-0,s=1,c=1,t=0,pt=7,l=5,sg=0:20.0
299676 TSF:MSG:READ,1-1-0,s=0,c=1,t=1,pt=7,l=5,sg=0:31.0
299686 TSF:MSG:READ,1-1-0,s=3,c=1,t=16,pt=2,l=2,sg=0:1

Should there not be a message formatted by ; also going to the gateway?

[rejoe2]

Imo all these messages are addressed to the GW. See https://www.mysensors.org/build/parser. Destination "0" stands for the gateway.
The log parser may also help to understand what is behind your other post here. The repeater node imo just acts as kind of sniffer and puts everything that's received to serial out, regardless if repeater functionality is necessay or not.