Root@OpenWrt:~# lsmod grep ftdi ftdi_sio 27856 1 usbcore 109781 7 ftdi_sio usbserial 18407 4 ftdi_sio. Connect the FTDI USB device to the router's USB port. Otveti na testi mba start 1 modulj 2.

Dec 04 2014 Filed In:, Although the TL-WR703N has a built in UART, as I have shown, it’s rather difficult to access, and is useful as a serial console in OpenWrt. For the support of your own apps, it is far more convenient to simply plug in a cheap USB to serial adapter — this can be done without even opening the case. Since the TL-WR703N only has one USB port, if you are using, both the serial adapter and the USB flash drive can be attached to a USB hub: The TL-WR703N can easily supply the required current, so an unpowered hub may be used. To add support for USB to serial hardware, use opkg to install the appropriate modules. Basic USB to serial support: opkg install kmod-usb-serial FTDI (FT232) support: opkg install kmod-usb-serial-ftdi Silicon Laboratories CP210x (CP2102) support: opkg install kmod-usb-serial-cp210x Nanjin QinHeng Electronics CH341 (CH340G): opkg install kmod-usb-serial-ch341 Prolific PL2303 support: opkg install kmod-usb-serial-pl2303 Additionally, OpenWrt has packages for a slew of other USB serial adapters that I’m not familiar with.

I have Openwrt router with Arduino connected via USB FTDI adapter. Serial port is /dev/ttyUSB0 Arduino code prints some data: First part of data printed with delay via command print(), for example: Serial.begin(9600); Serial.print(var1); delay(1000); Serial.print(var2); delay(1000); Serial.print(var3); delay(1000); And second part printed with println() command: Serial.println('); Serial.println(var4); Serial.println(var5); Serial.println(var6); So when I open Serial port in terminal I can see something like this: 1 then timeout in 1 sec, then 1 2 next timeout. And then 1 2 3 last timeout and 1 2 3 4 5 6 It works in Terminal program and in console in OpenWRT, for example screen /dev/ttyUSB0 I need make a Lua script that will read Serial port and print the data in the same way. I have a simple script, but it doesn't work as expected. Rserial=io.open('/dev/ttyUSB0','r') while true do chain = nil while chain==nil do chain=rserial:read(); print(chain) end end it shows all data at once. It doesn't show first 3 vars one by one with delays.

Seems it is because of rserial:read() - it will read until it receives a newline character. It stated in similar question: I tried to run this command as was advised there: stty -F /dev/ttyUSB0 -icanon but it doesn't help and I don't understand why. Is it the way to fix this behavior via stty?

Or I definitely need to use another Serial libs for Lua script? All of these libs seems pretty outdated for now and I don't want to use outdated stuff. From the: When called without formats, it uses a default format that reads the next line (see below). A new line is anything in the buffer until the next newline character.

So as long as you don't send a newline character Lua will wait one as it has been told by calling read() Once a newline character is received you will be prompted any other character in that line. Terminal programs usually update every byte to show what they receive in 'real-time'. So if you want to have the same behaviour you may not use read() without any arguments. Use read(1) to read every single byte without waiting for anything else.