Specifically, they were asked to design a cellular gateway board with the same five Gigabit Ethernet ports as on the original board, but adding five mini PCIe sockets and SIM card slots for 3G/4G cards, and one M.2 socket plus two SIM cards for a 5G module. Here’s the result!
- SoC – MediaTek MT7622E dual-core ARM Cortex-A53 processor @ 1.35GHz
- System Memory – 1 or 2GB RAM
- Storage – 8GB eMMC flash, MicroSD card slot
- 1x 5G via M.2 Key-B module (USB 3.0 or PCIe bus), 2x SIM card slots.
- Up to 5x 3G/4G LTE via mPCIe expansion socket, 5x SIM card slots
- Ethernet – 5x Gigabit Ethernet ports (4x LAN + 1x WAN)
- WiFi – Optional 802.11 b/g/n/ac WiFI 5 + Bluetooth via mPCIe socket (shared with 1x 3G/4G mPCIe socket) plus WiFi and BT antennas connectors
- Expansion – 26-pin GPIO header
- Misc – Reset button, 1x user key
- Power Supply – 12V/3A DC jack, 2-pin DC header, header for battery
According to a comparison table found on bitswrt, while MediaTek MT7622A and MT7622B processor comes with WiFi and Bluetooth connectivity, MT7622E does not, so WiFi and/or Bluetooth does require a separate (MT7615) mPCIe module.
The company mentions OpenWrt and Linux support but does not provide any firmware images in the Wiki, at least not yet. GrassRouter board appears to be focused on V2X communication applications such as smart police cars, medical rescue vehicles, engineering and emergency vehicles, cargo transport and passenger vehicles, high-speed rail, mobile finance, etc…