saltybot_cellular 0.1.0 Waveshare SIM7600X 4G HAT driver for SaltyBot. Provides GPS (NMEA → NavSatFix), cellular modem monitoring (AT commands), and MQTT telemetry relay over 4G LTE. Hardware: SIMCom SIM7600A-H, LTE Cat-4, GPS+GLONASS+BeiDou+Galileo. sl-controls MIT rclpy sensor_msgs geometry_msgs std_msgs diagnostic_msgs ament_python ament_copyright ament_flake8 ament_pep257 python3-pytest ament_python