MATLAB unable to detect Pixhawk4 port over WIFI (Linux)

I have been trying to run simulink files but unable to connect the Pixhawk to MATLAB over wifi using the esp8266 wifi module as it does not detect the port. I believe there is some Mavlink code missing/incorrect in the rc.txt file, as the Pixhawk connects to QGC over wifi perfectly without this file. I have tried all combinations of the code and 'serial port' options in the Configuration parameters>Hardware Implementation of Simulink, that i could find in the documentations.

Mavlink WIFI Bridge parameters:

WIFI_UDP_HPORT = 14550

WIFI_UDP_CPORT = 14555

UART_BAUDRATE = 57600

My rc.txt file has the following code:

#Copyright 2018 The MathWorks, Inc.

# This is the custom rc.txt which loads px4_simulink_app on start-up

usleep 1000

uorb start

usleep 1000

tone_alarm start

usleep 1000

px4io start

#gps start -f #Starts GPS driver and Fake a GPS signal (useful for testing)

usleep 1000

sh /etc/init.d/rc.sensors

usleep 1000

#Uncomment the below 2 lines to use LPE estimator

#attitude_estimator_q start

#local_position_estimator start

#Using EKF2 estimator by default as PX4 does build LPE on px4fmu-v2 due to a limited flash.

ekf2 start

usleep 1000

mtd start

usleep 1000

param load /fs/mtd_params

usleep 1000

rgbled start

usleep 1000

fmu mode_pwm # This is required for AUX PWM channels

usleep 1000

px4_simulink_app start

mavlink start -u 14550 -b 57600 -m onboard -r 80000

mavlink boot_complete

#exit #4-Jan-2019

even tried the following line:

mavlink start -d /dev/ttyS1 -b 57600 -m onboard -r 80000