FTP

There is a small internal file system accessible with each Pycom device, called /flash. This is stored within the external serial flash memory. If a microSD card is also connected and mounted, it will be available as well. When the device starts up, it will always boot from the boot.py located in the /flash file system.

The file system is accessible via the native FTP server running on each Pycom device. Open an FTP client and connect to:

• url: ftp://192.168.4.1
• username: micro
• password: python

See network.server for information on how to change the defaults. The recommended clients are:

• macOS/Linux: default FTP client
• Windows: Filezilla and FireFTP

For example, from a macOS/Linux terminal:

$ ftp 192.168.4.1

The FTP server doesn’t support active mode, only passive mode. Therefore, if using the native unix FTP client, immediately after logging in, run the following command:

ftp> passive

The FTP server only supports one connection at a time. If using other FTP clients, please check their documentation for how to limit the maximum allowed connections to one at a time.

FileZilla

If using FileZilla, it's important to configure the settings correctly.

Do not use the quick connect button. Instead, open the site manager and create a new configuration. Within the General tab, ensure that encryption is set to: Only use plain FTP (insecure).

In the Transfer Settings tab, limit the max number of connections to one. Other FTP clients may behave in a similar ways; visit their documentation for more specific information.