ModemAt Terminal

Cellular Modem AT Command Terminal & SMS PDU Hex Decoder

Hardware engineer's cellular and telecommunications modem terminal. Interfaces with 4G LTE, 5G, NB-IoT, and legacy dial-up modems over serial USB, executing Hayes AT command sequences, monitoring signal strength (CSQ, RSRP, RSRQ), and decoding SMS PDU octets.

Purchase License ($29.99) Open Live Web Portal

Real Desktop Application UI • 1280x800 Native GTK3 Workspace

100% Native Executable Node-Lock Verified

ModemAt Terminal — Live Native Desktop Workspace (Primary Window & Real GTK UI)

Head-to-Head Competitor Analysis

Why ModemAt Terminal is cheaper, faster, and more secure than AT Command Tester Pro ($49/yr).

Comparison Metric	ModemAt Terminal	AT Command Tester Pro ($49/yr)
License Model & Price	$29.99 (One-Time Perpetual)	$49/year recurring subscription
Annual Financial Savings	Save $40/yr every single year
Competitor Drawbacks	Heavy Java runtime requirement, awkward interface, lacks modern 5G RSRP/RSRQ cellular diagnostics
Why Vivian Is Better	One-time $29.99 perpetual license, native lightweight C++ binary, 5G signal monitors, integrated PDU decoder
Execution Environment	100% Offline Air-Gapped	Mandatory cloud check-in
Runtime Telemetry	Zero Telemetry (0.00KB sent)	Cloud telemetry & user tracking

Engineering Specifications & Features

Specialized AT command console with syntax highlighting, auto-complete, and command history

Cellular signal strength monitor: real-time graphical display of CSQ, RSSI, RSRP, RSRQ, and SINR

SMS PDU (Protocol Data Unit) bidirectional encoder and decoder supporting 7-bit, 8-bit, and UCS2 Unicode

Network registration status monitor (AT+CREG, AT+CGREG, AT+CEREG) for roaming and band attachment

SIM card toolkit: PIN/PUK verification, IMSI reading, and ICCID electronic identifier retrieval

Automated scripting engine: execute test sequences and log modem responses with microsecond timestamps

Graphical Interface (GUI) Architecture

Terminal window with command input bar, quick-macro buttons (Check Signal, SIM Status, Network Reg), signal meter widget, and PDU decoder tab.

Headless CLI Reference & Execution

ModemAt Terminal includes a headless command-line binary ready for automation pipelines, cron daemons, and CI/CD runners:

# Headless command execution:
modemat --terminal-sample --port /dev/ttyUSB2 --baud 115200 --send 'AT+CSQ' --decode-pdu
# Cryptographic node-lock activation:
modemat --activate YOUR-CROCKFORD-KEY

Core Architecture & Asymmetric Security

Asynchronous C++ serial communication engine with POSIX termios / Win32 Comm API ring buffer processing.