B4R Tutorial ESP8266 FTP Client


Staff member
Licensed User
To complete the B4X FTP season (https://www.b4x.com/android/forum/threads/74320/#content) I've written a client in B4R.

It allows to connect to a FTP server and download or upload files.

There is no SD card involved in this example. It downloads a file and prints its content and uploads a string (array of bytes) as the file content.

The file is stored in an array of bytes (FileBuffer). Its size is set to 1000. You can increase it if you want to download or upload larger files.

This example is based on the very useful GlobalStore module: https://www.b4x.com/android/forum/threads/module-globalstore-global-objects-storage.73863/#content
Note that GlobalStore was rewritten due to a bug in the previous version.

This is not a simple example as the FTP protocol is not so simple.
It is worth going over the code that handles the server messages.
The code in AStreamControl_NewData parses the incoming data and splits it based on the end of line characters.
The last line can be incomplete so it is stored in GlobalStore and is added to the next message.