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# View Source Getting Started

## General Information

The start/1 function starts a daemon process listening for UDP packets on a port. When it receives a request for read or write, it spawns a temporary server process handling the transfer.

On the client side, function read_file/3 and write_file/3 spawn a temporary client process establishing contact with a TFTP daemon and perform the file transfer.

`tftp` uses a callback module to handle the file transfer. Two such callback modules are provided, `tftp_binary` and `tftp_file`. See read_file/3 and write_file/3 for details. You can also implement your own callback modules, see CALLBACK FUNCTIONS. A callback module provided by the user is registered using option `callback`, see DATA TYPES.

## Using the TFTP client and server

This is a simple example of starting the TFTP server and reading the content of a sample file using the TFTP client.

Step 1. Create a sample file to be used for the transfer:

          $ echo "Erlang/OTP 21" > file.txt

Step 2. Start the TFTP server:

          1> {ok, Pid} = tftp:start([{port, 19999}]).
          {ok,<0.65.0>}

Step 3. Start the TFTP client (in another shell):

          1> tftp:read_file("file.txt", binary, [{port, 19999}]).
          {ok,<<"Erlang/OTP 21\n">>}

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