As you can see from debug log, node send a message and GW replied but node does not received anything. Strange thing is that some chars appeared in debug console "�vXvv���" before 2215 ?TSF:MSG:SEND,.....

For testing purpose Iv got on desk Ardu Nano as GW with MAX485 converters and as a node I tested with Whisky Delta lib one by one Arduino Mega2560 , Bluepill STM32F103c8t6 , Blackpill2 STM32F411 and F4VE (STM32F407VET). As a node is working only Mega2560. Bluepill were frozen after first attempt to pair with GW. Blackpill 2 and F4VE are repeating sending request for pair to GW with this strange chars in serial debug. ("�vXvv���")

Im sure that HW is ok. (wiring,DE+RE,termination resistors,5V supply of MAX485, etc)

Does anybody else has a problem like this ? Do you have any idea where should be a problem ?

Gateway received data from node and responded

0;255;3;0;9;8233171 TSF:MSG:READ,118-118-255,s=255,c=3,t=7,pt=0,l=0,sg=0:
0;255;3;0;9;8233177 TSF:MSG:BC
0;255;3;0;9;8233180 TSF:MSG:FPAR REQ,ID=118
0;255;3;0;9;8233184 TSF:PNG:SEND,TO=0
0;255;3;0;9;8233187 TSF:CKU:OK
0;255;3;0;9;8233190 TSF:MSG:GWL OK
0;255;3;0;9;8233447 TSF:MSG:SEND,0-0-118-118,s=255,c=3,t=8,pt=1,l=1,sg=0,ft=0,st=OK:0

Node trying to pair but does not receive data from gateway. What are chars �vXvv��� ?

2050 MCO:BGN:INIT OK,TSP=0
2211 !TSM:FPAR:NO REPLY
2213 TSM:FPAR
�vXvv���2215 ?TSF:MSG:SEND,118-118-255-255,s=255,c=3,t=7,pt=0,l=0,sg=0,ft=0

Simple node sketch. Debug is using Serial1 and MAX485 is using Serial2

#define MY_DEBUG                          

#define MY_TRANSPORT_WAIT_READY_MS 2000  

//#define MY_TRANSPORT_SANITY_CHECK
//#define MY_TRANSPORT_SANITY_CHECK_INTERVAL 2000 
//#define MY_RS485_SOH_COUNT 2

#define MY_NODE_ID 118

#define MY_RS485
#define MY_RS485_DE_PIN PB3

#define MY_RS485_HWSERIAL Serial2

#define MY_RS485_BAUD_RATE 9600


#include <MySensors.h>

#define CHILD_ID_SudyNode 0

MyMessage msgStatus(CHILD_ID_SudyNode, V_VAR1); //Status
MyMessage msgErrorEvent(CHILD_ID_SudyNode, V_VAR2); //Err event
MyMessage msgDebug(CHILD_ID_SudyNode, V_VAR3); //DEBUG


void presentation() {  sendSketchInfo("TestNODE", "Ver. 1");present(CHILD_ID_SudyNode, S_CUSTOM);}


void setup() {

     Serial.setRx(PA10);
     Serial.setTx(PA9);
     Serial.begin(115200);  

}

String SendBuffer = "TEST Message";
unsigned long CasovacMillis = millis();

void loop() {


if ((millis() - CasovacMillis) >= 3000) { 
 Serial.println("NODE ALIVE");
 send(msgStatus.set(SendBuffer.c_str()));
 CasovacMillis = millis();
}

}
void receive(const MyMessage &message) {
                        
  if (message.sensor == 123 ) {
      String BufferString = message.getString();
      char CommandBuffer[BufferString.length()];
      BufferString.toCharArray(CommandBuffer, BufferString.length()+1); 
      Serial.print("RECEIVED DATA: "); Serial.println(CommandBuffer);
}
}