out of 6 tested here at work, two couldn't route the ethernet signal to several different 2017 MacBook Pros with Sierra and High Sierra. One of them also gave an error message saying "Unplug the USB device because it's using too much power" - even with nothing plugged into the USB A port, nothing plugged into the other USB C port on a Mac and it had the same error whether the USB-C power cable was plugged into an adapter or another USB-C port. Others from the same brand worked, as did one of StarTechcom's older USB-C to DVI adapters.
HB-UMLS Sabrent USB 2.0 Hub with 4 Ports and LED Power Switches for Each Port
12 Review
π uni USB C Hub with Ethernet Adapter, 4K HDMI, Gigabit Ethernet, and 3 USB 3.0 Ports for MacBook Pro, iPad Pro, XPS
11 Review
VEMONT 7-Port USB Hub 3.0 with Individual On/Off Switches, LED Light, and 4ft/1.2m Long Cable - USB Splitter Extension for Laptop and PC Computer
9 Review
π Juiced Systems Silver BizHUB USB-C Multiport Gigabit HDMI Hub with 3 USB 3.0 Ports, Gigabit Ethernet, 4K HDMI, SD/Micro SD, and USB-C Power Delivery
11 Review
π CERRXIAN RS232 to Ethernet Serial Device Server - TCP/IP Converter with 1Port DB9 RS232 Serial to Ethernet Connectivity
3 Review
Smartphone Nubia Z11 6/64GB
12 Review
π USR-TCP232-410s: RS232/RS485 Serial to Ethernet Adapter/IP Device Server with DHCP/DNS Support
4 Review
π StarTech.com NETRS2321P: 1-Port RS232 to Ethernet IP Converter, Serial over IP Device Server - Black
5 Review