Use HAProxy as Modbus-Proxy

I use the following HAProxy config to create a modbus proxy:

haproxy.cfg

global
    daemon
    maxconn 256

defaults
    log     global
    mode    tcp
    option  tcplog
    option  dontlognull
    timeout connect 5000ms
    timeout client  1000ms # Client inactivity on connection to HAProxy
    timeout server  500ms # Server inactivity on connection from HAProxy to Inverter
    retries 3
	log stdout format raw local0 info

frontend modbus-frontend
    bind *:5020
	log 127.0.0.1 local0 debug
	mode tcp
    default_backend modbus-backend
    
backend modbus-backend
	mode tcp
	log 127.0.0.1 local1 debug
    server server1 192.168.1.101:1502 maxconn 1  # This is the IP of the actual modbus device
	balance leastconn
    timeout queue 15000

docker-compose.yml

services:
  haproxy:
    image: haproxy:3.3
    container_name: haproxy
    ports:
      - "5020:5020"
    volumes:
      - ./haproxy.cfg:/usr/local/etc/haproxy/haproxy.cfg
    restart: unless-stopped