Cannot get downlink messages from Chirpstack

[kadirozdinc]

Hi there, I try to implement getting downlink messages. When I send downlink messages to my node by using TTN network, I can get downlink messages at my node side but when switching to Chirpstack network and try to send downlink messages, I can not get any messages somehow.

In chirpstack I observe downlink messages, message drops only after I reset my node. When I send downlink to node after joining, downlink messages in chirpstack doesn't disappear/drop anymore, stay in the queue all the time.

Another question in my mind is :
I disconnect my gateway for a short time, Node change its Data rate to higher SF like 9 and can connect to gateway again. After reconnection to gateway, Data rate keeps same all the time. According to ADR algorithm, it should lower its SF and increase its data rate (AFAIK). why doesn't it increase its data rate again ?

Here is my repo :
https://github.com/kadirozdinc/ESPLORAWAN/tree/master