[Python] The commands are not running in Trace32 Tool

This is the code. Trace32 tool is opening but no commands is executing. What to do?

process=subprocess.Popen([t32_exe,'-s', start_up],stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
command="REACHED"
time.sleep(5)
process.stdin.write(command.encode())
process.stdin.flush()


This is the code. Trace32 tool is opening but no commands is executing. What to do? t32 is path to trace 32.exe and start_up is config.t32. file path

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