Define sensor ID In above setting, we have configure the sensor ID: sensor1,water,sensor3 and sensor4. Send data in pre-defined format Dragino runs a demon (IoTd) which will check all data get from its UART interface and check if it match this format:VALUE[.].

ELua stands for Embedded Lua and the project aims to offer the full set of features of the Lua Programming Language to the embedded world. ELua reference manual - UART module Overview. This module contains functions for accessing the serial ports (UARTs). The character read from the serial port as a string. Multiplatform library for serial communications over RS-232 (serial port) - ynezz/librs232.

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If it match, then the Dragino will store this values as the latest value of the sensor ID. It will store the data on local location or upload to IoT server periodically and then clear the data buffer. Examples of data format: • 8913367 • 1004378 in 1, Dragino will store: sensor1=89, sensor2=133 and water=67. In 2, Dragino will store: sensor1=100, sensor2=43, but no gas since gas is not a valid ID. Note: In the data format there should be one or more spaces between different sensor ID's.

Transparent Mode Latest version of Dragino support Transparent Mode. In this mode. Dragino won't do data validity in the UART port. It can receive any data comes from the UART port and store it.

Write Custom Code Users can write custom code for UART for their own application. In pre-load Dragino firmware, the UART port is used by the IoTd daemon (or pachubed in old version). You need to kill this daemon before testing your customized code, otherwise the test will fail. Run ps -av to find the daemon, in SSH access. While 1 do t = io.read ( ) -- read data from standard input (input in SSH) print (t ) serialout = io.open ( '/dev/ttyS0', 'w' ) --open serial port and prepare to send data to Arduino serialout: write (t ) --write data to Serial port serialout: flush ( ) -- serialin = io.open ( '/dev/ttyS0', 'r' ) --open serial port and prepare to read data from Arduino while line == nil do -- read data from serial. Line =serialin: read ( ) serialin: flush ( ) end print (line ) --print the data serialin:close ( ) serialout:close ( ) line = nil --clear the line data end to run this script. Run root@dragino:~# lua write.lua //run the script lua 6 //input data to be sent to the Arduino I received: 6 // read the return data from Arduino.

Native ports class serial. Serial __init__ ( port=None, baudrate=9600, bytesize=EIGHTBITS, parity=PARITY_NONE, stopbits=STOPBITS_ONE, timeout=None, xonxoff=False, rtscts=False, write_timeout=None, dsrdtr=False, inter_byte_timeout=None, exclusive=None ) Parameters: • port – Device name or None. • baudrate () – Baud rate such as 9600 or 115200 etc.

• bytesize – Number of data bits. Possible values:,,, • parity – Enable parity checking. Possible values:,,, • stopbits – Number of stop bits. Possible values:,, • timeout () – Set a read timeout value.

• xonxoff () – Enable software flow control. • rtscts () – Enable hardware (RTS/CTS) flow control.

• dsrdtr () – Enable hardware (DSR/DTR) flow control. • write_timeout () – Set a write timeout value.

• inter_byte_timeout () – Inter-character timeout, None to disable (default). • exclusive () – Set exclusive access mode (POSIX only). A port cannot be opened in exclusive access mode if it is already open in exclusive access mode. Raises: • – Will be raised when parameter are out of range, e.g. Baud rate, data bits.

• – In case the device can not be found or can not be configured. The port is immediately opened on object creation, when a port is given. It is not opened when port is None and a successive call to is required.

Port is a device name: depending on operating system. /dev/ttyUSB0 on GNU/Linux or COM3 on Windows. The parameter baudrate can be one of the standard values: 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800, 9600, 19200, 38400, 57600, 115200. These are well supported on all platforms.

Standard values above 115200, such as: 230400, 460800, 500000, 576000, 921600, 1000000, 1152000, 1500000, 2000000, 2500000, 3000000, 3500000, 4000000 also work on many platforms and devices. Non-standard values are also supported on some platforms (GNU/Linux, MAC OSX >= Tiger, Windows). Though, even on these platforms some serial ports may reject non-standard values. Possible values for the parameter timeout which controls the behavior of: • timeout = None: wait forever / until requested number of bytes are received • timeout = 0: non-blocking mode, return immediately in any case, returning zero or more, up to the requested number of bytes • timeout = x: set timeout to x seconds (float allowed) returns immediately when the requested number of bytes are available, otherwise wait until the timeout expires and return all bytes that were received until then. Is blocking by default, unless write_timeout is set.