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Service: ⭐⭐⭐⭐⭐ Tested in our German automation plant: rugged metal housing, DIN-rail mounted in 30 s; stable from –40 °C to +85 °C, zero packet loss after 8 weeks in a freezer and foundry. Dual-SIM + Ethernet failover <50 ms, still pushes 10 Mbps upstream on a 2-bar 4G signal. Modbus RTU → MQTT mapping without a single line of code; firmware OTA updated flawlessly on first try. Real-world draw: 1.8 W. CE/RCM certified, 2-year warranty, arrived in Hamburg in 3 days in 100 % recyclable packaging. Install it and forget it.