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This commit adds support for the Cudy LT400E v1, an indoor 4G/LTE WiFi router. It has 4x10/100 Mbps Ethernet ports, a 2.4 GHz radio, and a Quectel 4G/LTE EC200A modem. Hardware: SoC: MediaTek MT7628NN Flash: 8 MiB SPI RAM: 64 MiB Ethernet: 4x10/100 Mbps WiFi: 2.4 GHz (embedded MT7628, 802.11n) WWAN: Quectel EC200A-EL 4G/LTE Cat 4 modem SIM: nano-SIM slot Buttons: 1 Reset button, 1 WPS button LEDs: 10x (blue) Power: 12 V DC barrel jack Installation: The stock firmware is a customized variant of OpenWrt, which implements a signature check that only allows flashing official firmware. Cudy offers, on their website [1][6], intermediate OpenWrt firmware images which do not implement the signature check. After flashing the intermediate image, the upstream (i.e., official) OpenWrt image can be installed. See the device's entry in OpenWrt's Wiki for more details [2]. Cellular network: The Quectel EC200A modem is internally connected to the SoC via USB, and operates in ECM mode, supported by the CDC Ether driver [3]. When inserting a SIM card in the slot, if no PIN is needed, the network interface "usb0" is brought up and the cellular connection works out of the box. To interact with the modem directly (unlock the PIN, change APN and PDP settings, etc.), AT commands can be sent with picocom to serial port /dev/ttyUSB2 [4]. Recovery: The stock firmware can be recovered via TFTP, as the bootloader (based on U-Boot) implements a recovery client. Set up a TFTP server on your computer with IP 192.168.88.1/24 serving the stock firmware from Cudy's website renamed to "recovery.bin". Press the Reset button (keep it pressed), power on the device, wait for the TFTP server to send the recovery.bin file, then release the Reset button. The router will take a couple of minutes to reboot and set up the stock firmware. See the device's entry in OpenWrt's Wiki for more details [2]. Discussion: Use the dedicated thread in OpenWrt's forum to discuss any aspects [5]. Acknowledgments: The code to support this device is largely based on the sources kindly provided by Cudy in compliance with the GPL license. Thanks for supporting the OpenWrt community. Links: [1] https://www.cudy.com/blogs/faq/openwrt-software-download [2] https://openwrt.org/toh/cudy/lt400e_v1 [3] https://openwrt.org/docs/guide-user/network/wan/wwan/ethernetoverusb_cdc [4] https://openwrt.org/docs/guide-user/network/wan/wwan/at_commands [5] https://forum.openwrt.org/t/242466 [6] https://drive.google.com/drive/folders/1BKVarlwlNxf7uJUtRhuMGUqeCa5KpMnj Co-authored-by: rogerpueyo <roger.pueyo@guifi.net> Signed-off-by: Kamil Jońca <kjonca@onet.pl> Link: https://github.com/openwrt/openwrt/pull/21246 Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>