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SAMXT User Guide V1.5
8 The SAMXT TCP/IP Operation
The SAMXT has an MCU (Microcontroller) to control the LTE module ME910C1-AU. The
SAMXT can be operating in three different modes, defined by the parameter SAMMODE:
-SAMMODE=0. The modem is in standard mode. When powered on, the MCU turns on the LTE
module, checks its baud rate, turns on the LED and releases control of the LTE module to the
connecting device. AT commands can be sent from the serial port here after, the MCU will keep
monitoring the LTE module Rx pin for AT$ commands and checks time in the RESETPERIOD
parameter to reset itself and the LTE module.
-SAMMODE=1. The modem is in PSD (Packet Switch Data) smart mode. The MCU is in total
control of the LTE module. When powered on the software reads all parameters from flash and
activates a PSD connection, it then creates a UDP and a TCP socket to listen for data transfer
connection, opens a UDP and a TCP socket to listen for remote AT commands connection. If
programmed as a TCP client it will try to connect to a remote TCP server, the modem then stays
in PSD online idle state waiting for SMS, UDP or TCP connection. The software maintains PSD
connectivity by means of PING using POLLPERIOD parameter stored in flash.
8.1 Communication Sockets
TCP Data: The socket connection allows transparent data (excluded IP header) to pass
through from the remote host to the modem serial port and vice versa. In TCP
server mode, the socket will be disconnected after 5 minutes of no data transfer.
UDP Data: The socket connection allows transparent data to pass through from the remote
host to the modem serial port and vice versa. A block of data received from a
remote UDP server will open a 2 minutes window for data to be transferred from
the serial port.
TCP AT Command: The socket connection allows a user from the host computer to send AT
commands to the modem and receive its responses. The socket will be
disconnected after 5 minutes of no activity. The socket can also be used for
remote firmware update.
UDP AT Command: The socket connection allows a user from the host computer to send AT
commands to the modem and receive its responses. The socket can also be
used for remote firmware update.
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Summary of Contents for SAMXT
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