text: I am running DebWrt on my Asus RT-N16 and it works well. The only problem that I have is: in case I misconfigure something and the device is inaccessible via the network, I need to open the case then connect a serial port to fix it. Because the configuration is in USB, I don’t have to open the case very often, in most cases, I can unplug the USB disk, mount it in my Linux machine, try to fix the configuration, plug the USB again, restart the router, and hope that my fix works. Either way, both are such a hassle.
  I could have added a serial port just like my DIR-300 mod, but I think it’s not the best solution. Because I still need to bring down my router, find my serial cable, plug it in and connect to it. I wish that the device has a Bluetooth capability, so I can connect to it (via Bluetooth serial port profile), fix any problem that it has, and without moving or plugging anything, and hopefully I don’t even need to restart the router and wait for it to boot.
  So I bought a 7.32 USD bluetooth module from Aliexpress and installed it on my RT-N16. Some of you may think that it is a bad idea because Bluetooth interferes (somewhat) with WIFI, but I don’t plan to keep constant connection via Bluetooth, and when I do make the connection, the data that I am transferring is very small (maybe just several kilobytes per minutes). So far in my testing, when connected via Bluetooth, I didn’t notice any speed difference in WIFI transfer speed (even when transferring large files via WIFI) and typing furiously from my Bluetooth terminal. Asus RTN16 only supports 2.4 GHz, but If your router supports 5GHz, I think you should use that band to eliminate any possible interference.
  My version of Bluetooth module is H-C07, and for this version, the device doesn’t use \r or \n to terminate command, it just uses time out to end a command (a complete command must be received within few hundreds millisecond). Typing very-very quickly in your terminal won’t work, so just copy and paste the command from your text editor. The command needed to set the Bluetooth module to 115200 is “AT+BAUD8”. These Bluetooth modules usually don’t come with documentation, so you need to look on the internet for your specific version.
  One of the nice thing about Bluetooth is: it is accessible from non-PC devices. After connecting the cables, I can connect to my router using Android Bluetooth SPP
  One thing to note: the Bluetooth module needs time to initialize, so it can not be used for accessing the bootloader. To restart the router, I need to plug and unplug the power cable. So the Bluetooth module will lose its connection when I restart the device. By the time the Bluetooth module is ready, the bootloader has already passed and you will be in the middle of Linux booting.
  Author adminPosted on January 22, 2013 July 26, 2018 Categories debian, hacks7 Comments on Adding Bluetooth Serial Port to Asus RT-N16
  
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