api.ledControl(color, state)

This function turns on or off the on board LED. It can be used for debugging purposes.

Arguments

• color (integer) - The color of LED to control: 0 for red, 1 for green and 2 for blue
• state (integer) - The new state of the LED: 1 for on and 0 for off

Example

api.ledControl(2,1) --turns on blue LED

—

api.delayms(ms)

This function makes the execution be paused for ms milliseconds.

Arguments

• ms (integer) - The number of milliseconds to delay

Example

api.delayms(1000) --delay one second

—

tick = api.getTick( )

This function returns current number of milliseconds since startup. Counts up to 2^32 and then restarts from 0.

Returns

• tick (integer) - Number of milliseconds since startup of the device

Example

--get a timestamp, can be used for timing 
timestamp = api.getTick()

—

data,error,acked,wake,intArg = api.getGUIContext( )

This function returns context provided by GUI configuration, if LoRaWAN is used.

Returns

• data (string) - Data received using parsing table configured by GUI tool
• error (integer) - Zero on success, positive value indicates line number from the request table defined by GUI, which caused the error
• acked (integer) - According to GUI, data should be sent using acknowledged (1) or non-acknowledged (0) LoRa transport
• wake (integer) - Number of minutes, according to GUI, the device should sleep using wakeUpIn() function.
• intArg (integer) - Used with S0 callback onThreshold(), contains the number of S0 input, which raised the event.

Example

--get context provided by GUI configuration 
data,error,acked,wake = api.getGUIContext()

—

data,error,proto,wake,ip,port,intArg = api.getGUIContext( )

This function returns context provided by GUI configuration, if NB-IoT is used.

Returns

• data (string) - Data received using parsing table configured by GUI tool
• error (integer) - Zero on success, positive value indicates line number from the request table defined by GUI, which caused the error
• proto (integer) - Zero if UDP protocol is used, one if TCP is used
• wake (integer) - Number of minutes, according to GUI, the device should sleep using wakeUpIn() function.
• ip (string) - String with NB-IoT host IP address
• port (integer) - NB-IoT host port number
• intArg (integer) - Used with S0 callback onThreshold(), contains the number of S0 input, which raised the event.

Example

--get context provided by GUI configuration 
buf, err, proto, wake, ip, port = api.getGUIContext()

—

num = api.getUniqueNumber()

This function returns an unique integer number in range <0; 2^32>.

Returns

• num (integer) - Unique number

Example

--get an unique number 
num = api.getUniqueNumber()

—

value = api.getVar(index )

This function returns persistent variable value, can be used between different wake up iterations.

Arguments

• index (integer) - Index of the variable to read, 0 to 15 is available for RAM variables (lost on reset), 16 to 47 for High Endurance EEPROM (HEE) variables (6.4M writes) and 48 to 1071 is available for variables stored in EEPROM (100k writes).

Returns

• value (integer) - Value of the 32bit variable

Example

--get persistent variable value from index 1000 
--can be used to send different data between wake-ups 
--for variables persistent between device reset, 
--use indexes 48 to 1071 
slotNumber = api.getVar(1000)

—

api.setVar(index, value )

This function saves a persistent variable value, can be used between different wake up iterations.

Arguments

• index (integer) - Index of the variable to read, 0 to 15 is available for RAM variables (lost on reset), 16 to 47 for High Endurance EEPROM (HEE) variables (6.4M writes) and 48 to 1071 is available for variables stored in EEPROM (100k writes). value (integer) - Value to store at index

Example

--set persistent variable value from index 1000 to value of 3424 
--can be used to send different data between wake-ups 
--for variables persistent between device reset, 
--use indexes 48 to 1071 
api.setVar(1000, 3424)

—

api.setVerbosity(verbosity )

This function sets verbosity level.

Arguments

• verbosity (integer) - Zero removes all debug printing, verbosity increases up to value of four representing the maximum details

Example

--print only critical errors, other print outs are suppressed 
api.setVerbosity(1)

—

volt = api.getBatteryVoltage(index )

This function provides a measured value of battery voltage in millivolts as return value.

Returns

• mv (integer) - Current battery voltage in millivolts

Example

--get battery voltage value in mV 
mv = api.getBatteryVoltage()

—

status = api.wakeUpAt(day, hour, minute, second)

This function schedules the next wake up event of the device to provided day of month (day), hour, minute and second. The provided wake up date is therefore absolute and not relative as in wakeUpIn().

Arguments

• day (integer) - Day of month, range 1 to 31
• hour (integer) - Hour, range 0 to 23
• minute (integer) - Minute, range 0 to 59
• second (integer) - Second, range 0 to 59

Returns

• status (integer) - Execution status, 0 for success and -1 for error

Example

--schedules next wake up to the 25th, 2:22:58 
status = api.wakeUpAt(25, 2, 22, 58)

—

status = api.wakeUpIn(day, hour, minute, second)

This function schedules the next wake up event of the device after specified time interval. The provided wake up date is therefore relative and not absolute as in wakeUpAt(). Note: The input arguments are not limited, but the total period specified must not exceed 31 days. (e.g. hour = 40, days = 2 gives a period of 3 days and 16 hours).

Arguments

• day (integer) - Day, range 0 to 31
• hour (integer) - Hour, range 0 to X
• minute (integer) - Minute, range 0 to X
• second (integer) - Second, range 0 to X

Returns

• status (integer) - Execution status, 0 for success and -1 for error

Example

--schedules next wake up in 1 day and 122 minutes 
status = api.wakeUpIn(1, 0, 122, 0)

—

year, month,day,hour,minute,second = api.getTimeDate()

This function returns current time running in the device. The time can be synchronized using LoRa or debug cable.

Returns

• year (integer) - Current year
• month (integer) - Current month
• day (integer) - Current day of month
• hour (integer) - Current hour
• minute (integer) - Current minute
• second (integer) - Current second

Example

--read current date and time 
y,M,d,h,m,s = api.getTimeDate()

—

api.dumpArray( str)

This function prints contents of variable as hexadecimal string.

Arguments

• str (string) - String with variable to be printed

Example

--print string "123ef" as hexadecimal 
api.dumpArray("123ef") 
00 : 31 32 33 65 66

—

result = api.float(operation, format, arg1, arg2)

This function performs operation on supplied floating point data.

Arguments

• operation (string) - The operation to perform (“add” - addition, “sub” - substraction of arg2 from arg1, “mul” - multiplication, “div” - division of arg1 by arg2, “coerce” - coercion, unary operation using only arg1)
• format (string) - Two or three characters specifying the format of input/output data. The first position is for arg1 (S - string float representation, e.g. “2.234”, B - binary little endian IEEE 754 representation as 4 characters/bytes in a string). The second either specifies the format of arg2 or if last, specifies the format of return data, which are the same adding “N” - coerce and return as little endian integer.
• arg1 (string) - The first operation argument, formated as specified in format.
• arg2 (string) - The second operation argument, formated as specified in format.

Returns

• result (string, integer) - Returns result of operation, either 4 bytes little endian IEEE 754 float or string float representation or integer value

Example

-- Multiply IEE 754 float with a floating point constant and return coerced value 
ret = api.float("mul", "BSN", input, "1000.0")

—

temp = api.ds18b20GetTemp(pwrpin, datapin)

This function returns temperature in Celsius from DS18B20.

Arguments

• pwrpin (integer, optional) - Power pin (0 - 3)
• datapin (integer, optional) - Data pin (0 - 3)

Returns

• temp (integer) - Temperature in Celsius

—

sak, uid = api.RFID(retry)

This function scans RFID to see UID, SAK, type and data blocks.

Arguments

• retry (integer) - Number of possible failed reads from RFID before reading is stopped

Returns

* //sak// (integer) - SAK (Select acknowledge) byte returned from the PICC after successful selection
* //uid// (string) - UID of RFID

—

api.exec(function)

This function executes specified function by name. Function has to be present in fragments.

Arguments

• function (string) - Name of function to be executed

status, port, answer = api.loraSend( ack, timeout, msg, port)

This function sends buffer msg to LoRa. Acknowledged or non-acknowledged transport can be used using ack parameter. Maximum execution time is limited by timeout miliseconds.

Arguments

• ack (integer) - Selects acknowledged (1) or non-acknowledged (0) transport mode
• timeout (integer) - The maximum execution time in milliseconds, used in acknowledged mode
• msg (string) - String to be sent to LoRa
• port (integer, optional) - Port number

Returns

• status (integer) - Positive or zero for success, negative for failure
• port (integer) - Nil or port on which the answer was received
• answer (string) - Nil or non-zero length string containing gateway answer

Example

--sends 0xCCBBAA35 to LoRa with 20s timeout and acknowledged mode
msg = pack.pack('<b4', 0xCC, 0xBB, 0xAA, 0x35)
status,port,answer = api.loraSend(1,20000, msg)

—

status = api.loraSetup( class, dataRate, power, ADR)

This function sends buffer msg to LoRa. Acknowledged or non-acknowledged transport can be used using ack parameter. Maximum execution time is limited by timeout miliseconds.

Arguments

• class (string) - Select LoRaWAN class (either A or C)
• dataRate (integer, optional) - Set data rate: 0 - 7
• power (integer, optional) - Transmit power: 2, 5, 8, 11, 14 dBm
• ADR (integer, optional) - Automatic data rate: 0 for off, 1 for on

Returns

• status (integer) - Positive or zero for success, negative for failure

Example

--setup LoRaWAN interface to class A with data rate 0 (SF12), power of 20 dBm and ADR off
status = api.loraSetup("A", 0, 20, 0)

—

status, port, buffer = api.loraListenClassC(timeout)

This function listens on LoRa with class C until some message is received.

Arguments

• timeout (integer, optional) - Timeout of listening in miliseconds, default is 10000 ms

Returns

• status (integer) - Positive or zero for success, negative for failure
• port (integer) - Communication port
• buffer (string) - Message received from LoRa

Example

--Listen on LoRa for a message with default timout of 10 seconds 
status, port, buffer = api.loraListenClassC()

—

status, port, buffer = api.loraListenGW(timeout)

This function listens on LoRa until GW message is received.

Arguments

• timeout (integer, optional) - Timeout of listening in miliseconds, default is 10000 ms

Returns

• status (integer) - Positive or zero for success, negative for failure
• port (integer) - Communication port
• buffer (string) - Message received from LoRa
• address (integer) - GW node address

Example

--Listen on LoRa for a GW message with default timout of 10 seconds 
status, port, buffer, address = api.loraListenGW()

—

api.loraSetCredentials(devADDR, devEUI, nwsKey, appsKey, appEUI, appKey)

This function sets LoRa credentials.

Arguments

• devADDR (string) - Device ADDR
• devEUI (string) - Device EUI
• nwsKey (string) - NWS key
• appsKey (string) - APPS key
• appEUI (string, optional) - Application EUI
• appKey (string, optional) - Application key

Example

--Set LoRa credentials 
api.loraSetCredentials("22011221","3333333333333333","44444444444444444444444444444444","55555555555555555555555555555555", "70B344440013333")

status, answer = api.nbSend( addr, port, msg, timeout, type)

This function sends buffer msg to NB on specified IP, port and protocol type. Maximum length of Rx and Tx messages is 512 Bytes. Maximum execution time is limited by timeout miliseconds.

Arguments

• addr (string) - IP address
• port (integer) - Port
• msg (string) - String to be sent to NB
• timeout (integer) - The maximum execution time in milliseconds
• type (string) - Protocol type, either UDP or TCP.

Returns

• status (integer) - Zero for success, negative for failure
• answer (string) - Nil or non-zero length string containing the answer

Example

-- sends "test message" string to IP 185.8.239.192 on port 5566 with 6s timeout 
status,answer = api.nbSend("185.8.239.192", 5566, "test message", 6000, "UDP") 
 
-- sends buffer to IP and port specified in GUI with 6s timeout 
buf, err, proto, wake, ip, port, ctx = api.getGUIContext() 
status,answer = api.nbSend(ip, port, "test message", 6000, proto)

—

answer, status = api.nbAT(command, timeout, wakeUp)

This function sends an AT command to NB module with specified timeout.

Arguments

• command (string) - AT command
• timeout (integer) - The maximum execution time in miliseconds
• wakeUp (integer, optional) - Sending 1 will make sure that module is not asleep

Returns

• answer (string) - Nil or non-zero length string with an answer to a AT command
• status (integer) - Zero for success, negative for failure

Example

-- Get IMSI number of SIM card with timeout of 4 seconds 
res = api.nbAT("AT+CIMI", 4000)
print(res)

status, c, a, ci, answer = api.mbusTransaction( msg, timeout, retry=1) This function transmits msg and waits timeout milliseconds for the answer. The transmission is retried retry times. The status contains information about communication status and c, a, ci and answer contains MBus answer data. Turn on MBus using mbusState first. >

Arguments

• msg (string) - Message to send to MBus
• timeout (integer, optional) - The maximum time in milliseconds to wait for MBus device answer
• retry (integer, optional) - Optional number of retransmissions, defaults to 1 >

Returns

• status (integer) - Number of bytes received, zero on failure
• c (integer) - MBus c frame field
• a (integer) - MBus a frame field
• ci (integer) - MBus ci frame field
• answer (string) - MBus frame payload received from the bus

Example

--sends MBus frame [0x10, 0x50, 0x30, 0x16], waits 5s for answer twice 
msg = pack.pack('<b4', 0x10, 0x50, 0x30, 0x16) 
status,c,a,ci,ans = api.mbusTransaction(msg, 5000, 2)

—

api.mbusSetup( baudrate, parity, stopBits, dataBits) This function configures the MBus communication interface. By default, the configuration from GUI is used, but this can be overriden using this API. Turn on MBus using mbusState after setting up MBus parameters using this function. >

Arguments

• baudrate (integer, optional) - Baudrate to use for communication (up to 921600 baud)
• parity (integer, optional) - Parity, 0 for none, 1 for odd and 2 for even parity
• stopBits (integer, optional) - Number of stop bits, 1 or 2 allowed
• dataBits (integer, optional) - Number of data bits, 7 or 8 allowed

Example

--setup MBus interface to 9600 Baud, 8E2 
api.mbusSetup(9600, 2, 2, 8)

—

api.mbusState( state)

This function turns on the MBus circuitry, must be used before mbusTransaction.

Arguments

• state (integer) - New state of MBus circuitry: 0 for off, 1 for on (apprx 30s power-up)

Example

api.mbusState(1) --turn on MBus

api.rs485Send( msg)

This function sends msg to RS485 bus. Turn on RS485 using rs485State first.

Arguments

• msg (string) - Data to be sent to RS485 bus

Example

api.rs485Send('test') 
--sends 'test' string to RS485

—

api.rs485Setup( baudrate, parity, stopBits, dataBits)

This function changes the configuration of RS485 interface

Arguments

• baudrate (integer, optional) - Baudrate to use for communication (up to 921600 baud)
• parity (integer, optional) - Parity, 0 for none, 1 for odd and 2 for even parity
• stopBits (integer, optional) - Number of stop bits, 1 or 2 allowed
• dataBits (integer, optional) - Number of data bits, 7 or 8 allowed

Example

--setup RS485 interface to 9600 Baud, 8E1 
api.rs485Setup(9600, 2, 1, 8)

—

api.rs485State( state)

This function turns on the RS485 circuitry, must be used before rs485Send or rs485Receive.

Arguments

• state (integer) - New state of RS485 circuitry: 0 for off, 1 for on (fast power-up)

Example

api.rs485State(0) --turn off RS485

—

answer,len = api.rs485Receive( timeout)

This function waits timeout milliseconds for data reception from RS485 bus. Turn on RS485 using rs485State first.

Arguments

• timeout (integer) - The maximum time in milliseconds to wait for RS485 device answer

Returns

• answer (string) - Data received from RS485 bus in given time
• len (integer) - Number of bytes received

Example

--waits 1s for answer from RS485 bus 
ans,len = api.rs485Receive(1000)

—

crc = api.modbusCrc( msg)

This function calculates Modbus request checksum.

Arguments

• msg (string) - Modbus request

Returns

• crc (string) - Modbus crc for request

Example

--calculate checksum for Modbus request 110100010002 
req = pack.pack('<b6', 0x11,0x01,0x00,0x01,0x00,0x02) 
crc = api.modbusCrc(req) --crc = "EE9B"

msg, answer = api.nvtProcess(buf)

This function processes NVT message and either sets baudrate, datasize, parity or stop size for MBUS or MODBUS.

Arguments

• buf (string) - Message to be processed

Returns

• msg (string) - Message without NVT sequence
• answer (string) - NVT answer

Example

ret,port,buf = api.loraSend(0,1000,data) 
if buf ~= nil then 
	buf, nvtans = api.nvtProcess(buf) 
	api.rs485Send(buf)
end

—

answer = api.nvtEncode(msg)

This function encodes message to NVT format.

Arguments

• msg (string) - Message to be encoded to NVT

Returns

• answer (string) - NVT message

Example

ans,len = api.rs485Receive(50) 
ans = api.nvtEncode(ans) 
api.loraSend(0,1,ans)

api.daliTransaction(command, address, isDirect)

This function transmits Dali command to specified address.

Arguments

• command (integer) - Dali command
• address (integer, optional) - Address to
• isDirect (integer, optional) - 1 if message is direct, 0 if not

Returns

• answer (integer) - Nil or non-zero if an answer has been received from Dali device (when non direct transmission is used)

Example

-- initialize Dali device 
ans = api.daliTransaction(0xA500)

api.S0setThreshold(channel, value)

This function defines a threshold between current value of a S0 channel counter and last reported value. When the difference of these last two reaches the value, the onThreshold() event is called.

Arguments

• channel (integer) - Number of the S0 channel, 0 to 3.
• value (integer) - Threshold value, 0 disables the threshold, 0x1-0xFFFFFFFF sets the threshold.

Example

--sets threshold for channel 2 to the value of 10000 
api.S0setThreshold(2, 10000)

—

api.S0initializeCounter(channel, value)

This function is typically used on startup to restore current value of the S0 counter from a non-volatile memory

Arguments

• channel (integer) - Number of the S0 channel, 0 to 3.
• value (integer) - Value of the S0 counter

Example

--sets counter value for channel 0 to the value of 100 
api.S0initializeCounter(0, 100)

—

value = api.S0readCounter(channel)

This function reports the current value of the S0 channel counter specified in the channel input argument. Note: By calling this function, an internal shadow variable for the channel counter is updated, so that the counter for onThreshold() event is reset.

Arguments

• channel (integer) - Number of the S0 channel, 0 to 3.

Returns

• value (integer) - Value of the S0 counter

Example

--reads the value of S0 channel 3 and stores to val variable 
val = api.S0readCounter(3)

status = api.wmbusSetup(power, role, mode)

This function changes the configuration of W-MBUS.

Arguments

• power (integer) - W-MBUS power: -20 dBm, -10 dBm, 0 dBm, 5 dBm, 9 dBm
• role (string) - W-MBUS role: master, slave, meter, concentrator, repeater
• mode (string) - W-MBUS mode: S1, S2, T1, T2, T1_C, T2_C, R

Returns

• status (integer) - Positive or zero for success, negative for failure

Example

--setup W-MBus interface to power of 9 dBm, role master/concentrator and T2 mode 
api.wmbusSetup(9, "master", "T2")

—

status = api.wmbusSetCField(c_field)

This function sets W-MBUS C field.

Arguments

• c_field (integer) - W-MBUS C field (max value 255)

Returns

• status (integer) - Positive or zero for success, negative for failure

Example

-- Set W-Mbus C field as 128 
api.wmbusSetCField(128)

—

status = api.wmbusSetHeader(manid, id, version, devtype)

This function sets W-MBUS header.

Arguments

• manid (integer) - Manufacturer ID, max value 0xffff
• id (integer) - ID of W-MBUS device (32 bit)
• version (integer) - Version fiels, max value 0xff
• devtype (integer) - Device version field, max value 0xff

Returns

• status (integer) - Positive or zero for success, negative for failure

Example

-- Set W-Mbus header for specific device 
api.wmbusSetHeader()

—

status = api.wmbusSendFrame(ci, data)

This function sends frame through W-MBUS.

Arguments

• ci (integer) - CI field
• data (string) - Frame to be sent

Returns

• status (integer) - Positive or zero for success, negative for failure

Example

-- Send W-MBUS frame 
api.wmbusSendFrame(212, "foobar")

—

status, c_fielf, manid, id, version, devtype, ci, payload = api.wmbusReceiveFrame(timeout)

This function waits timeout milliseconds for data reception from W-mbus.

Arguments

• timeout (integer) - The maximum time in milliseconds to wait for RS485 device answer

Returns

• status (integer) - Positive or zero for success, negative for failure
• c_field (integer) - W-MBUS C field (max value 255)
• manid (integer) - Manufacturer ID, max value 0xffff
• id (integer) - ID of W-MBUS device (32 bit)
• version (integer) - Version fiels, max value 0xff
• devtype (integer) - Device version field, max value 0xff
• ci (integer) - CI field
• payload (string) - Received frame payload

Example

-- Receive W-MBUS data with 2000 ms timeout 
status, cfield, manid, id, ver, devtype, ci, payload = api.wmbusReceiveFrame(2000)

—

status, c_fielf, manid, id, version, devtype, ci, payload = api.wmbusSendReceiveFrame(ci, payload, debugon)

This function is only available for W-mbus in meter role.

Arguments

• ci (integer) - CI field
• payload (string) - Payload to be send
• debugon (integer) - If 1, then debug prints of wmbus frame will be present in stdout

Returns

• status (integer) - Positive or zero for success, negative for failure
• c_field (integer) - W-MBUS C field (max value 255)
• manid (integer) - Manufacturer ID, max value 0xffff
• id (integer) - ID of W-MBUS device (32 bit)
• version (integer) - Version fiels, max value 0xff
• devtype (integer) - Device version field, max value 0xff
• ci (integer) - CI field
• payload (string) - Received frame payload

—

status, c_fielf, manid, id, version, devtype, ci, payload = api.wmbusReceiveSendFrame(ci, payload, timeout)

This function is only available for W-mbus in concentrator role. It waits timeout milliseconds for data reception from W-mbus.

Arguments

• ci (integer) - CI field
• payload (string) - Payload to be send
• timeout (integer) - The maximum time in milliseconds to wait for RS485 device answer

Returns

• status (integer) - Positive or zero for success, negative for failure
• c_field (integer) - W-MBUS C field (max value 255)
• manid (integer) - Manufacturer ID, max value 0xffff
• id (integer) - ID of W-MBUS device (32 bit)
• version (integer) - Version fiels, max value 0xff
• devtype (integer) - Device version field, max value 0xff
• ci (integer) - CI field
• payload (string) - Received frame payload

status = api.DIOwaitForEvent**(pin, event, sync, timeout)

This function waits for specified event on certain pin.

Arguments

• pin (integer, optional) - Pin number 0-3
• event (integer, optional) - Event to wait for: 0 - unregister, 1 - rising, 2 - falling, 3 - both
• sync (integer, optional) - If 1, then sync event is requested
• timeout (integer, optional) - The maximum time in milliseconds to wait

Returns

• status (integer) - Positive for success, negative for failure, zero means that event has been unregistered from pin.

—

state = api.DIOreadPin(pin)

This function reads pin state.

Arguments

• pin (integer, optional) - Pin number 0-3

Returns

• state (integer) - 1 if pin is set, 0 if not.

—

status = api.DIOwritePin(pin, state)

This function writes pin state.

Arguments

• pin (integer, optional) - Pin number 0-3
• state (integer, optional) - Pin state: -1 - high impedance, 0 - low, 1 - high

Returns

• status (integer) - Zero for success, negative for failure

To be used with the GUI based configuration of the device. A basic error handling is provided and the device wakes up as defined per GUI.

function onWake () 
    buf,err,ack,wake,intArg = api.getGUIContext()
 
    if err ~= 0 then
        print("Error occured on line" .. tostring(err))
        print("Sending error code to LORA")
        api.loraSend(ack,20000,tostring(err))
        print("Done sending")
    else
        print("Sending to LORA")
        api.loraSend(ack,20000,buf)
        print("Done sending")
        print("No error, sent to lora")
    end
 
    api.wakeUpIn(0,0,wake,0)
end
function onStartup()
    print("Starting up LUA interface...")
end

This script sends two different MBus requests to two different devices at two different baud rates. The two devices share the same MBus. To be compliant with LoRa transmission duty cycle, each device is read out in its own time slot. Furthermore, the battery voltage information is sent every third time slot.

function onWake () 
    buf,err,ack,wake,intArg = api.getGUIContext()
 
    state = api.getVar(0)
 
 
    if state == 0 then
        api.mbusSetup(2400, 2, 1, 8)
        api.mbusState(1)
        status, ans = api.mbusTransaction(
         pack.pack('<b5', 0x10,0x12,0x34,0x56,0x16),
         4000, 1)
        api.mbusState(0)
        state = 1
    elseif state == 1 then
        api.mbusSetup(9600, 2, 1, 8)
        api.mbusState(1)
        status, ans = api.mbusTransaction(
         pack.pack('<b5', 0x10,0x78,0x9A,0xBC,0x16),
         3000, 2)
        api.mbusState(0)
        state = 2
    else
        volt = api.getBatteryVoltage
        ans = "Battery: " .. tostring(volt) .. "mV"
        wake = 2*wake --sleep twice more time
        state = 0
    end
 
    print("Sending to LORA")
    api.loraSend(ack,20000,ans)
    print("Done sending")
    api.wakeUpIn(0,0,wake,0)
    api.setVar(0,state)
end
function onStartup()
    print("Starting up LUA interface...")
end

This script defines a LUA function wordToBuffer() for easy insertion of 32bit integer to a buffer and getS0Data() function, which is used to format a packet containing values from S0 counters and current battery voltage. A new event is used - onThreshold(), which is called when an S0 channel is incremented by a defined amount of units (here the value is setup to 1000 in the onStartup() callback function). The data frame is sent to LoRa either periodically or when the threshold is hit.

function wordToBuffer(word)
    local buff = ""
    buff = buff ..  string.char(word%256) ..  string.char((word/256)%256)
    buff = buff .. string.char(((word/256)/256)%256)
    buff = buff .. string.char((((word/256)/256)/256)%256) 
    return buff
end
 
-- get and format S0 inputs
function getS0Data()
    s00 = api.S0readCounter(0) 
    print("S0-0: "..tostring(s00))
    s01 = api.S0readCounter(1) 
    print("S0-1: "..tostring(s01))
    s02 = api.S0readCounter(2)
    print("S0-2: "..tostring(s02))
    s03 = api.S0readCounter(3) 
    print("S0-3: "..tostring(s03))
 
    -- read old values
    s00_l = api.getVar(0)
    s01_l = api.getVar(1)
    s02_l = api.getVar(2)
    s03_l = api.getVar(3)
 
    s00_ll = api.getVar(4)
    s01_ll = api.getVar(5)
    s02_ll = api.getVar(6)
    s03_ll = api.getVar(7)
 
    -- update old values
    api.setVar(0, s00)
    api.setVar(1, s01)
    api.setVar(2, s02)
    api.setVar(3, s03)
 
    api.setVar(4, s00_l)
    api.setVar(5, s01_l)
    api.setVar(6, s02_l)
    api.setVar(7, s03_l)
 
    -- get battery voltage
    v = api.getBatteryVoltage()
 
    -- assemble the frame
    buf = string.char(5) -- device class
    buf = buf .. wordToBuffer(s00) 
    buf = buf .. wordToBuffer(s00_l) 
    buf = buf .. wordToBuffer(s00_ll) 
    buf = buf .. wordToBuffer(s01) 
    buf = buf .. wordToBuffer(s01_l) 
    buf = buf .. wordToBuffer(s01_ll) 
    buf = buf .. wordToBuffer(s02) 
    buf = buf .. wordToBuffer(s02_l) 
    buf = buf .. wordToBuffer(s02_ll) 
    buf = buf .. wordToBuffer(s03) 
    buf = buf .. wordToBuffer(s03_l) 
    buf = buf .. wordToBuffer(s03_ll) 
 
    buf = buf .. string.char(0)
    buf = buf .. string.char(v%256) ..  string.char((v/256)%256)
    buf = buf .. string.char(0)
 
    -- print the frame
    print("Frame in hex: <devClass, S0_0, S0_0_last, ... , 0, voltage, 0>")
    api.dumpArray(buf)
 
    return buf
 
end
 
function onWake () 
    buf,err,ack,wake = api.getGUIContext()
    print("onWake(), periodic wake up")
    buf = getS0Data()
        print("Sending to LORA")
        api.loraSend(ack,20000,buf)
        print("Done sending")
        print("No error, sent to lora")
 
    api.wakeUpIn(0,0,wake,0)
 
end
 
function onThreshold ()
        buf,err,ack,wake,src = api.getGUIContext()
 
        print("onThreshold(), reason S0: " .. tostring(src))
 
        buf = getS0Data()
        print("Sending to LORA")
        api.loraSend(ack,20000,buf)
        print("Done sending")
        print("No error, sent to lora")
end 
 
 
function onStartup()
    print("onStartup(), Starting up LUA interface...")
 
    --set to threshold
    api.S0setThreshold(0, 1000)
    api.S0setThreshold(1, 1000)
    api.S0setThreshold(2, 1000)
    api.S0setThreshold(3, 1000)
 
    -- initialize old values
    api.setVar(0, 0)
    api.setVar(1, 0)
    api.setVar(2, 0)
    api.setVar(3, 0)
    api.setVar(4, 0)
    api.setVar(5, 0)
    api.setVar(6, 0)
    api.setVar(7, 0)
end

This library provides basic mathematic functions, note that for simplicity, lua in this embedded device uses integer and not float arithmetics. Any function from this library is prepended by “math.”. The list of supported functions is: abs, ceil, floor, max, min, pow, random, randomseed, sqrt. For more details and function arguments definition, refer to official Lua 5.1 documentation: https://www.lua.org/manual/5.1/manual.html (Section 5.6, mathematical functions)

The pack library is used as a convenient way to parse binary buffers and to create a binary representation of lua variables. Any function from this library is prepended by “pack.”. The list of supported functions is: pack, unpack. For more details and function arguments definition, refer to eLua project pages: http://www.eluaproject.net/doc/v0.8/en_refman_gen_pack.html#overview

This library can be used for manipulation of string variables and string buffers. Any function from this library is prepended by “string.”. The list of supported functions is: byte, char, format, len, sub. For more details and function arguments definition, refer to official Lua 5.1 documentation: https://www.lua.org/manual/5.1/manual.html (Section 5.4, string manipulation)

This library contains a basic lua 5.1 language library. The list of supported functions is: assert, collectgarbage, dofile, error, gcinfo, getfenv, getmetatable, loadfile, load, loadstring, next, pcall, print, rawequal, rawget, rawset, select, setfenv, setmetatable, tonumber, tostring, type, unpack, xpcall. For more details and function arguments definition, refer to official Lua 5.1 documentation: https://www.lua.org/manual/5.1/manual.html (Section 5.1, basic functions)

This library is used for debugging. Any function from this library is prepended by “debug.”. List of supported functions is: debug, getfenv, gethook, getinfo, getlocal, getregistry, getmetatable, getupvalue, setfenv, sethook, setlocal, setmetatable, setupvalue, traceback. For more details and function arguments definition, refer to official Lua 5.1 documentation: https://www.lua.org/manual/5.1/manual.html (Section 5.9, the debug library)