Integration Manual

TSD-19090601 - R15 Contents Page 55 of 143
 Bridge mode: In bridge mode the module acts as a cellular modem dongle connected to the host over
serial interface. The IP termination of the network is placed on the host IP stack. The module is configured
as a bridge which means the network IP address is assigned to the host (host IP termination).
 Router mode: In router mode the module acts as a cellular modem router which means the IP
termination of the network is placed on the Internal IP stack of the module (on-target IP termination).
In particular, in this configuration the application processor belongs to a private network and is not
aware of the mobile connectivity setup of the module.
For more details about IP modes of operation, see the TOBY-L3 series AT command manual [2].
1.15.4 Dual stack IPv4 and IPv6
TOBY-L3 series modules support both Internet Protocol version 4 and Internet Protocol version 6 in parallel.
For more details about dual stack IPv4 and IPv6 see the TOBY-L3 series AT command manual [2].
1.15.5 Embedded TCP/IP and UDP/IP
TOBY-L3 series modules provide embedded TCP/IP and UDP/IP protocol stack: a PDP context can be
configured, established and handled via the data connection management packet switched data commands.
TOBY-L3 series modules provide Direct Link mode to establish a transparent end-to-end communication
with an already connected TCP or UDP socket via serial interfaces (USB, UART). In Direct Link mode, data
sent to the serial interface from an external application processor is forwarded to the network and vice-
versa.
For more details about the embedded TCP/IP and UDP/IP functionalities, see the TOBY-L3 series AT
commands manual [2].
1.15.6 Embedded FTP and FTPS
TOBY-L3 series modules provide embedded File Transfer Protocol (FTP) and FTP over SSL (FTPS) services.
Files are read and stored in the local file system of the module, it can also be transfered between the file
FTP server and the external application processor via serial interfaces (USB, UART) in FTP (or FTPS) Direct
link mode:
 FTP (or FTPS) download: data coming from the FTP server is forwarded to the host processor via USB
/ UART serial interfaces (for FTP without Direct Link mode, the data is always stored in the module’s
Flash File System)
 FTP (or FTPS) upload: data coming from the host processor via USB / UART serial interface is forwarded
to the FTP server (for FTP without Direct Link mode, the data is read from the module’s Flash File System)
When Direct Link is used for a FTP (or FTPS) file transfer, only the file content pass through USB / UART
serial interface, whereas all the FTP (or FTPS) commands handling is managed internally by the FTP
application.