Cannot find parent, node does not recieve pong response

[nopact]

I have a gateway Arduino Nano with Adafruit rfm9x lora radio which is working well with a couple of moteino+rfm95 boards.
Recently i bought a TTGO ESP32 oled lora module (868/915 MHZ) and tried to connect with the gateway.

This is the node log:

35 MCO:BGN:INIT NODE,CP=RLNNF---,FQ=240,REL=0,VER=2.4.0-alpha
51 MCO:BGN:BFR
71 TSM:INIT
72 TSF:WUR:MS=0
86 TSM:INIT:TSP OK
88 TSM:INIT:STATID=201
92 TSF:SID:OK,ID=201
96 TSM:FPAR
99 TSM:FPAR:STATP=0
103 TSM:ID
106 TSM:ID:OK
110 TSM:UPL
9626 !TSF:MSG:SEND,201-201-0-0,s=255,c=3,t=24,pt=1,l=1,sg=0,ft=0,st=NACK:1
11633 TSM:UPL
18634 !TSF:MSG:SEND,201-201-0-0,s=255,c=3,t=24,pt=1,l=1,sg=0,ft=1,st=NACK:1
20641 !TSM:UPL:FAIL
20642 TSM:FPAR
20646 TSM:FPAR:STATP=0
20650 TSM:ID
20653 TSM:ID:OK
20657 TSM:UPL
27660 !TSF:MSG:SEND,201-201-0-0,s=255,c=3,t=24,pt=1,l=1,sg=0,ft=2,st=NACK:1
29667 TSM:UPL
36668 !TSF:MSG:SEND,201-201-0-0,s=255,c=3,t=24,pt=1,l=1,sg=0,ft=3,st=NACK:1
38675 !TSM:UPL:FAIL
38676 TSM:FPAR
38680 TSM:FPAR:STATP=0
38684 TSM:ID
38687 TSM:ID:OK
38691 TSM:UPL
45694 !TSF:MSG:SEND,201-201-0-0,s=255,c=3,t=24,pt=1,l=1,sg=0,ft=4,st=NACK:1
47701 TSM:UPL

And this is the gateway log:

0;255;3;0;9;0 MCO:BGN:INIT GW,CP=RLNGA---,FQ=16,REL=0,VER=2.4.0-alpha
0;255;3;0;9;6 TSM:INIT
0;255;3;0;9;8 TSF:WUR:MS=0
0;255;3;0;9;20 TSM:INIT:TSP OK
0;255;3;0;9;23 TSM:INIT:GW MODE
0;255;3;0;9;26 TSM:READY:ID=0,PAR=0,DIS=0
0;255;3;0;9;29 MCO:REG:NOT NEEDED

0;255;3;0;14;Gateway startup complete.
0;255;0;0;18;2.4.0-alpha
0;255;3;0;9;33 MCO:BGN:STP
0;255;3;0;9;40 MCO:BGN:INIT OK,TSP=1
0;255;3;0;9;44 TSM:READY:NWD REQ
0;255;3;0;9;96 ?TSF:MSG:SEND,0-0-255-255,s=255,c=3,t=20,pt=0,l=0,sg=0,ft=0,st=OK:
0;255;3;0;9;2136 TSF:MSG:READ,201-201-0,s=255,c=3,t=24,pt=1,l=1,sg=0:1
0;255;3;0;9;2142 TSF:MSG:PINGED,ID=201,HP=1
0;255;3;0;9;5148 !TSF:MSG:SEND,0-0-201-201,s=255,c=3,t=25,pt=1,l=1,sg=0,ft=0,st=NACK:1
0;255;3;0;9;8027 TSF:MSG:READ,201-201-0,s=255,c=3,t=24,pt=1,l=1,sg=0:1
0;255;3;0;9;8033 TSF:MSG:PINGED,ID=201,HP=1
0;255;3;0;9;11060 !TSF:MSG:SEND,0-0-201-201,s=255,c=3,t=25,pt=1,l=1,sg=0,ft=0,st=NACK:1
0;255;3;0;9;17037 TSF:MSG:READ,201-201-0,s=255,c=3,t=24,pt=1,l=1,sg=0:1
0;255;3;0;9;17043 TSF:MSG:PINGED,ID=201,HP=1
0;255;3;0;9;20080 !TSF:MSG:SEND,0-0-201-201,s=255,c=3,t=25,pt=1,l=1,sg=0,ft=0,st=NACK:1
0;255;3;0;9;26065 TSF:MSG:READ,201-201-0,s=255,c=3,t=24,pt=1,l=1,sg=0:1
0;255;3;0;9;26072 TSF:MSG:PINGED,ID=201,HP=1
0;255;3;0;9;29010 !TSF:MSG:SEND,0-0-201-201,s=255,c=3,t=25,pt=1,l=1,sg=0,ft=0,st=NACK:1
0;255;3;0;9;35076 TSF:MSG:READ,201-201-0,s=255,c=3,t=24,pt=1,l=1,sg=0:1
0;255;3;0;9;35082 TSF:MSG:PINGED,ID=201,HP=1
0;255;3;0;9;38044 !TSF:MSG:SEND,0-0-201-201,s=255,c=3,t=25,pt=1,l=1,sg=0,ft=0,st=NACK:1
0;255;3;0;9;44103 TSF:MSG:READ,201-201-0,s=255,c=3,t=24,pt=1,l=1,sg=0:1
0;255;3;0;9;44109 TSF:MSG:PINGED,ID=201,HP=1

in the node i defined

   #define MY_NODE_ID 201                          
   #define MY_PARENT_NODE_ID 0
   #define MY_PARENT_NODE_IS_STATIC

and i tried it also with

   #define MY_NODE_ID 201                          
//   #define MY_PARENT_NODE_ID 0
//   #define MY_PARENT_NODE_IS_STATIC

As far is i can see in the log parser, the node sends a "find parent ping" to the gateway, which sends the response as a "pong" back to the node. But the response is not received by the node, so they do not connect.
I had to use the newest version of mysensors in order to be able to upload it to the ESP32.

Any ideas on how to solve this issue?