demo_esp32_send_pic.py

I am trying demo_esp32_send_pic.py by Maixduino.

However, the picture cannot be sent due to the following error.
connect error: [Errno 111] ECONNREFUSED

Is there any way to improve it?

The following firmware are used.
maixpy_v0.4.0_82_gc3327b5.bin
maixduino_esp32_firmware_v1.4.0.bin