Changes for page DS20L -- LoRaWAN Smart Distance Detector User Manual 01

Last modified by Mengting Qiu on 2023/12/14 11:15

From 83.1 to 84.1 From 93.1 to 94.1

From version 84.1

edited by Xiaoling
on 2023/06/15 15:30

Change comment: Uploaded new attachment "image-20230615153004-2.png", version {1}

To version 93.1

edited by Saxer Lin
on 2023/08/05 10:45

Change comment: There is no comment for this version

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- image-20230805103904-1.png
- image-20230805104104-2.png

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Author

@@ -1,1 +1,1 @@
--XWiki.Xiaoling
++XWiki.Saxer

Content

@@ -35,7 +35,7 @@
  Each LDS12-LB is pre-load with a set of unique keys for LoRaWAN registrations, register these keys to local LoRaWAN server and it will auto connect after power on.
--[[image:image-20230614162334-2.png||height="468" width="800"]]
++[[image:image-20230615152941-1.png||height="459" width="800"]]
  == 1.2 Features ==
@@ -55,7 +55,6 @@
  * 8500mAh Battery for long term use
--
  == 1.3 Specification ==
@@ -102,7 +102,6 @@
  * LoRa Transmit Mode: 125mA @ 20dBm, 82mA @ 14dBm
--
  == 1.4 Applications ==
@@ -115,7 +115,6 @@
  * Sewer
--
  (% style="display:none" %)
  == 1.5 Sleep mode and working mode ==
@@ -133,7 +133,7 @@
  (% border="1" cellspacing="4" style="background-color:#f2f2f2; width:510px" %)
--|=(% style="width: 167px;background-color:#D9E2F3;color:#0070C0" %)**Behavior on ACT**|=(% style="width: 117px;background-color:#D9E2F3;color:#0070C0" %)**Function**|=(% style="width: 225px;background-color:#D9E2F3;color:#0070C0" %)**Action**
++|=(% style="width: 167px;background-color:#4F81BD;color:white" %)**Behavior on ACT**|=(% style="width: 117px;background-color:#4F81BD;color:white" %)**Function**|=(% style="width: 225px;background-color:#4F81BD;color:white" %)**Action**
  |(% style="width:167px" %)Pressing ACT between 1s < time < 3s|(% style="width:117px" %)Send an uplink|(% style="width:225px" %)(((
  If sensor is already Joined to LoRaWAN network, sensor will send an uplink packet, (% style="color:blue" %)**blue led** (%%)will blink once.
  Meanwhile, BLE module will be active and user can connect via BLE to configure device.
@@ -146,7 +146,6 @@
  |(% style="width:167px" %)Fast press ACT 5 times.|(% style="width:117px" %)Deactivate Device|(% style="width:225px" %)(% style="color:red" %)**Red led**(%%) will solid on for 5 seconds. Means device is in Deep Sleep Mode.
--
  == 1.7 BLE connection ==
@@ -200,7 +200,7 @@
  The LPS8v2 is already set to connected to [[TTN network >>url:https://console.cloud.thethings.network/]], so what we need to now is configure the TTN server.
--[[image:image-20230614162359-3.png||height="468" width="800"]](% style="display:none" %)
++[[image:image-20230615153004-2.png||height="459" width="800"]](% style="display:none" %)
  (% style="color:blue" %)**Step 1:**(%%) Create a device in TTN with the OTAA keys from LDS12-LB.
@@ -246,31 +246,101 @@
  == 2.3 Uplink Payload ==
++=== 2.3.1 Device Status, FPORT~=5 ===
--(((
--LDS12-LB will uplink payload via LoRaWAN with below payload format:
--)))
++Users can use the downlink command(**0x26 01**) to ask LDS12-LB to send device configure detail, include device configure status. LDS12-LB will uplink a payload via FPort=5 to server.
++
++The Payload format is as below.
++
++(% border="1" cellspacing="4" style="background-color:#f2f2f2; width:510px" %)
++|=(% style="width: 60px;background-color:#4F81BD;color:white" %)(((
++**Size(bytes)**
++)))|=(% style="width: 100px; background-color: #4F81BD;color:white;" %)**1**|=(% style="width: 100px; background-color: #4F81BD;color:white;" %)**2**|=(% style="background-color: #4F81BD;color:white; width: 100px;" %)**1**|=(% style="background-color: #4F81BD;color:white; width: 100px;" %)**1**|=(% style="background-color: #4F81BD;color:white; width: 50px;" %)**2**
++|(% style="width:62.5px" %)Value|(% style="width:110px" %)Sensor Model|(% style="width:48px" %)Firmware Version|(% style="width:94px" %)Frequency Band|(% style="width:91px" %)Sub-band|(% style="width:60px" %)BAT
++
++Example parse in TTNv3
++
++[[image:image-20230805103904-1.png||height="131" width="711"]]
++
++(% style="color:blue" %)**Sensor Model**(%%): For LDS12-LB, this value is 0x24
++
++(% style="color:blue" %)**Firmware Version**(%%): 0x0100, Means: v1.0.0 version
++
++(% style="color:blue" %)**Frequency Band**:
++
++0x01: EU868
++
++0x02: US915
++
++0x03: IN865
++
++0x04: AU915
++
++0x05: KZ865
++
++0x06: RU864
++
++0x07: AS923
++
++0x08: AS923-1
++
++0x09: AS923-2
++
++0x0a: AS923-3
++
++0x0b: CN470
++
++0x0c: EU433
++
++0x0d: KR920
++
++0x0e: MA869
++
++(% style="color:blue" %)**Sub-Band**:
++
++AU915 and US915:value 0x00 ~~ 0x08
++
++CN470: value 0x0B ~~ 0x0C
++
++Other Bands: Always 0x00
++
++(% style="color:blue" %)**Battery Info**:
++
++Check the battery voltage.
++
++Ex1: 0x0B45 = 2885mV
++
++Ex2: 0x0B49 = 2889mV
++
++
++=== 2.3.2 Uplink Payload, FPORT~=2 ===
++
++
  (((
--Uplink payload includes in total 11 bytes.
++LDS12-LB will send this uplink **after** Device Status once join the LoRaWAN network successfully. And LDS12-LB will:
++
++periodically send this uplink every 20 minutes, this interval [[can be changed>>https://111]].
++
++Uplink Payload totals 11 bytes.
  )))
  (% border="1" cellspacing="4" style="background-color:#f2f2f2; width:510px" %)
--|=(% style="width: 62.5px;background-color:#4F81BD;color:white" %)(((
++|=(% style="width: 60px;background-color:#4F81BD;color:white" %)(((
  **Size(bytes)**
--)))|=(% style="width: 62.5px;background-color:#4F81BD;color:white" %)**2**|=(% style="width: 62.5px;background-color:#4F81BD;color:white" %)**2**|=(% style="background-color:#4F81BD;color:white" %)**2**|=(% style="background-color:#4F81BD;color:white" %)**2**|=(% style="background-color:#4F81BD;color:white" %)**1**|=(% style="background-color:#4F81BD;color:white" %)**1**|=(% style="background-color:#4F81BD;color:white" %)**1**
--|(% style="width:62.5px" %)Value|(% style="width:62.5px" %)[[BAT>>||anchor="H2.3.1BatteryInfo"]]|(% style="width:62.5px" %)(((
--[[Temperature DS18B20>>||anchor="H2.3.2DS18B20Temperaturesensor"]]
--)))|[[Distance>>||anchor="H2.3.3Distance"]]|[[Distance signal strength>>||anchor="H2.3.4Distancesignalstrength"]]|(((
--[[Interrupt  flag>>||anchor="H2.3.5InterruptPin"]]
--)))|[[LiDAR temp>>||anchor="H2.3.6LiDARtemp"]]|(((
--[[Message Type>>||anchor="H2.3.7MessageType"]]
++)))|=(% style="width: 30px;background-color:#4F81BD;color:white" %)**2**|=(% style="width: 80px;background-color:#4F81BD;color:white" %)**2**|=(% style="width: 50px;background-color:#4F81BD;color:white" %)**2**|=(% style="width: 70px;background-color:#4F81BD;color:white" %)**2**|=(% style="background-color:#4F81BD;color:white; width: 80px;" %)**1**|=(% style="background-color: #4F81BD;color:white; width: 70px;" %)**1**|=(% style="background-color: #4F81BD;color:white; width: 70px;" %)**1**
++|(% style="width:62.5px" %)Value|(% style="width:62.5px" %)[[BAT>>||anchor="HBatteryInfo"]]|(% style="width:62.5px" %)(((
++[[Temperature DS18B20>>||anchor="HDS18B20Temperaturesensor"]]
++)))|[[Distance>>||anchor="HDistance"]]|[[Distance signal strength>>||anchor="HDistancesignalstrength"]]|(% style="width:122px" %)(((
++[[Interrupt flag & Interrupt_level>>||anchor="HInterruptPin26A0InterruptLevel"]]
++)))|(% style="width:54px" %)[[LiDAR temp>>||anchor="HLiDARtemp"]]|(% style="width:96px" %)(((
++[[Message Type>>||anchor="HMessageType"]]
  )))
--[[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LLDS12-LoRaWAN%20LiDAR%20ToF%20Distance%20Sensor%20User%20Manual/WebHome/1654833689380-972.png?rev=1.1||alt="1654833689380-972.png"]]
++[[image:image-20230805104104-2.png||height="136" width="754"]]
--=== 2.3.1 Battery Info ===
++==== (% style="color:blue" %)**Battery Info**(%%) ====
  Check the battery voltage for LDS12-LB.
@@ -280,7 +280,7 @@
  Ex2: 0x0B49 = 2889mV
--=== 2.3.2 DS18B20 Temperature sensor ===
++==== (% style="color:blue" %)**DS18B20 Temperature sensor**(%%) ====
  This is optional, user can connect external DS18B20 sensor to the +3.3v, 1-wire and GND pin . and this field will report temperature.
@@ -293,7 +293,7 @@
  If payload is: FF3FH :  (FF3F & FC00 == 1) , temp = (FF3FH - 65536)/10 = -19.3 degrees.
--=== 2.3.3 Distance ===
++==== (% style="color:blue" %)**Distance**(%%) ====
  Represents the distance value of the measurement output, the default unit is cm, and the value range parsed as a decimal number is 0-1200. In actual use, when the signal strength value Strength.
@@ -304,7 +304,7 @@
  If the data you get from the register is 0x0B 0xEA, the distance between the sensor and the measured object is 0BEA(H) = 3050 (D)/10 = 305cm.
--=== 2.3.4 Distance signal strength ===
++==== (% style="color:blue" %)**Distance signal strength**(%%) ====
  Refers to the signal strength, the default output value will be between 0-65535. When the distance measurement gear is fixed, the farther the distance measurement is, the lower the signal strength; the lower the target reflectivity, the lower the signal strength. When Strength is greater than 100 and not equal to 65535, the measured value of Dist is considered credible.
@@ -317,7 +317,7 @@
  Customers can judge whether they need to adjust the environment based on the signal strength.
--=== 2.3.5 Interrupt Pin ===
++==== (% style="color:blue" %)**Interrupt Pin & Interrupt Level**(%%) ====
  This data field shows if this packet is generated by interrupt or not. [[Click here>>||anchor="H3.3.2SetInterruptMode"]] for the hardware and software set up.
@@ -331,7 +331,7 @@
 x01: Interrupt Uplink Packet.
--=== 2.3.6 LiDAR temp ===
++==== (% style="color:blue" %)**LiDAR temp**(%%) ====
  Characterize the internal temperature value of the sensor.
@@ -341,7 +341,7 @@
  If payload is: F2(H) <<24>>24=-14(D),LiDAR temp=-14℃.
--=== 2.3.7 Message Type ===
++==== (% style="color:blue" %)**Message Type**(%%) ====
  (((
@@ -358,10 +358,9 @@
  |(% style="width:160px" %)0x02|(% style="width:163px" %)Reply configures info|(% style="width:173px" %)[[Configure Info Payload>>||anchor="H3.ConfigureLDS12-LB"]]
++=== 2.3.3 Decode payload in The Things Network ===
--=== 2.3.8 Decode payload in The Things Network ===
--
  While using TTN network, you can add the payload format to decode the payload.
  [[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LLDS12-LoRaWAN%20LiDAR%20ToF%20Distance%20Sensor%20User%20Manual/WebHome/1654592762713-715.png?rev=1.1||alt="1654592762713-715.png"]]
@@ -376,15 +376,9 @@
  )))
--== 2.4 Uplink Interval ==
++== 2.4 Show Data in DataCake IoT Server ==
--The LDS12-LB by default uplink the sensor data every 20 minutes. User can change this interval by AT Command or LoRaWAN Downlink Command. See this link: [[Change Uplink Interval>>||anchor="H3.3.1SetTransmitIntervalTime"]]
--
--
--== 2.5 Show Data in DataCake IoT Server ==
--
--
  (((
  [[DATACAKE>>url:https://datacake.co/]] provides a human friendly interface to show the sensor data, once we have data in TTN, we can use [[DATACAKE>>url:https://datacake.co/]] to connect to TTN and see the data in DATACAKE. Below are the steps:
  )))
@@ -417,13 +417,13 @@
  [[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LDDS75%20-%20LoRaWAN%20Distance%20Detection%20Sensor%20User%20Manual/WebHome/image-20220610165129-11.png?width=1088&height=595&rev=1.1||alt="image-20220610165129-11.png"]]
--== 2.6 Datalog Feature ==
++== 2.5 Datalog Feature ==
  Datalog Feature is to ensure IoT Server can get all sampling data from Sensor even if the LoRaWAN network is down. For each sampling, LDS12-LB will store the reading for future retrieving purposes.
--=== 2.6.1 Ways to get datalog via LoRaWAN ===
++=== 2.5.1 Ways to get datalog via LoRaWAN ===
  Set PNACKMD=1, LDS12-LB will wait for ACK for every uplink, when there is no LoRaWAN network,LDS12-LB will mark these records with non-ack messages and store the sensor data, and it will send all messages (10s interval) after the network recovery.
@@ -440,7 +440,7 @@
  [[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LHT65N%20LoRaWAN%20Temperature%20%26%20Humidity%20Sensor%20Manual/WebHome/image-20220703111700-2.png?width=1119&height=381&rev=1.1||alt="图片-20220703111700-2.png" height="381" width="1119"]]
--=== 2.6.2 Unix TimeStamp ===
++=== 2.5.2 Unix TimeStamp ===
  LDS12-LB uses Unix TimeStamp format based on
@@ -457,7 +457,7 @@
  So, we can use AT+TIMESTAMP=1611889405 or downlink 3060137afd00 to set the current time 2021 – Jan ~-~- 29 Friday 03:03:25
--=== 2.6.3 Set Device Time ===
++=== 2.5.3 Set Device Time ===
  User need to set (% style="color:blue" %)**SYNCMOD=1**(%%) to enable sync time via MAC command.
@@ -467,13 +467,13 @@
  (% style="color:red" %)**Note: LoRaWAN Server need to support LoRaWAN v1.0.3(MAC v1.0.3) or higher to support this MAC command feature, Chirpstack,TTN V3 v3 and loriot support but TTN V3 v2 doesn't support. If server doesn't support this command, it will through away uplink packet with this command, so user will lose the packet with time request for TTN V3 v2 if SYNCMOD=1.**
--=== 2.6.4 Poll sensor value ===
++=== 2.5.4 Poll sensor value ===
  Users can poll sensor values based on timestamps. Below is the downlink command.
  (% border="1" cellspacing="5" style="background-color:#f2f2f2; width:425.818px" %)
--|(% colspan="4" style="background-color:#d9e2f3; color:#0070c0; width:423px" %)**Downlink Command to poll Open/Close status (0x31)**
++|(% colspan="4" style="background-color:#4f81bd; color:white; width:423px" %)**Downlink Command to poll Open/Close status (0x31)**
  |(% style="width:58px" %)**1byte**|(% style="width:127px" %)**4bytes**|(% style="width:124px" %)**4bytes**|(% style="width:114px" %)**1byte**
  |(% style="width:58px" %)31|(% style="width:127px" %)Timestamp start|(% style="width:124px" %)Timestamp end|(% style="width:114px" %)Uplink Interval
@@ -494,7 +494,7 @@
  )))
--== 2.7 Frequency Plans ==
++== 2.6 Frequency Plans ==
  The LDS12-LB uses OTAA mode and below frequency plans by default. If user want to use it with different frequency plan, please refer the AT command sets.
@@ -502,9 +502,9 @@
  [[http:~~/~~/wiki.dragino.com/xwiki/bin/view/Main/End%20Device%20Frequency%20Band/>>http://wiki.dragino.com/xwiki/bin/view/Main/End%20Device%20Frequency%20Band/]]
--== 2.8 LiDAR ToF Measurement ==
++== 2.7 LiDAR ToF Measurement ==
--=== 2.8.1 Principle of Distance Measurement ===
++=== 2.7.1 Principle of Distance Measurement ===
  The LiDAR probe is based on TOF, namely, Time of Flight principle. To be specific, the product emits modulation wave of near infrared ray on a periodic basis, which will be reflected after contacting object. The product obtains the time of flight by measuring round-trip phase difference and then calculates relative range between the product and the detection object, as shown below.
@@ -512,7 +512,7 @@
  [[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LLDS12-LoRaWAN%20LiDAR%20ToF%20Distance%20Sensor%20User%20Manual/WebHome/1654831757579-263.png?rev=1.1||alt="1654831757579-263.png"]]
--=== 2.8.2 Distance Measurement Characteristics ===
++=== 2.7.2 Distance Measurement Characteristics ===
  With optimization of light path and algorithm, The LiDAR probe has minimized influence from external environment on distance measurement performance. Despite that, the range of distance measurement may still be affected by the environment illumination intensity and the reflectivity of detection object. As shown in below:
@@ -550,7 +550,7 @@
  )))
--=== 2.8.3  Notice of usage ===
++=== 2.7.3  Notice of usage ===
  Possible invalid /wrong reading for LiDAR ToF tech:
@@ -561,10 +561,9 @@
  * The sensor window is made by Acrylic. Don't touch it with alcohol material. This will destroy the sensor window.
++=== 2.7.4  Reflectivity of different objects ===
--=== 2.8.4  Reflectivity of different objects ===
--
  (% border="1" cellspacing="5" style="background-color:#f2f2f2; width:379px" %)
  |=(% style="width: 54px;background-color:#4F81BD;color:white" %)Item|=(% style="width: 231px;background-color:#4F81BD;color:white" %)Material|=(% style="width: 94px;background-color:#4F81BD;color:white" %)Relectivity
  |(% style="width:53px" %)1|(% style="width:229px" %)Black foam rubber|(% style="width:93px" %)2.4%
@@ -589,7 +589,6 @@
  |(% style="width:53px" %)18|(% style="width:229px" %)Reflector plate, reflective tape|(% style="width:93px" %)>300%
--
  = 3. Configure LDS12-LB =
  == 3.1 Configure Methods ==
@@ -604,7 +604,6 @@
  * LoRaWAN Downlink.  Instruction for different platforms: See [[IoT LoRaWAN Server>>http://wiki.dragino.com/xwiki/bin/view/Main/]] section.
--
  == 3.2 General Commands ==
@@ -705,84 +705,34 @@
  * Example 2: Downlink Payload: 06000003      ~/~/   Set the interrupt mode to rising edge trigger
++=== 3.3.3  Set Power Output Duration ===
--=== 3.3.3 Get Firmware Version Info ===
++Control the output duration 3V3 . Before each sampling, device will
++~1. first enable the power output to external sensor,
--Feature: use downlink to get firmware version.
++2. keep it on as per duration, read sensor value and construct uplink payload
--(% style="color:blue" %)**Downlink Command: 0x26**
++3. final, close the power output.
--(% border="1" cellspacing="5" style="background-color:#f2f2f2; width:492px" %)
--|(% style="background-color:#4f81bd; color:white; width:191px" %)**Downlink Control Type**|(% style="background-color:#4f81bd; color:white; width:57px" %)**FPort**|(% style="background-color:#4f81bd; color:white; width:91px" %)**Type Code**|(% style="background-color:#4f81bd; color:white; width:153px" %)**Downlink payload size(bytes)**
--|(% style="width:191px" %)Get Firmware Version Info|(% style="width:57px" %)Any|(% style="width:91px" %)26|(% style="width:151px" %)2
++(% style="color:blue" %)**AT Command: AT+3V3T**
--* Reply to the confirmation package: 26 01
--* Reply to non-confirmed packet: 26 00
++(% border="1" cellspacing="4" style="background-color:#f2f2f2; width:510px" %)
++|=(% style="width: 155px;background-color:#4F81BD;color:white" %)**Command Example**|=(% style="width: 197px;background-color:#4F81BD;color:white" %)**Function**|=(% style="width: 158px;background-color:#4F81BD;color:white" %)**Response**
++|(% style="width:154px" %)AT+3V3T=?|(% style="width:196px" %)Show 3V3 open time.|(% style="width:157px" %)0 (default)
++OK
++|(% style="width:154px" %)AT+3V3T=1000|(% style="width:196px" %)Close after a delay of 1000 milliseconds.|(% style="width:157px" %)OK
++|(% style="width:154px" %)AT+3V3T=0|(% style="width:196px" %)Always turn on the power supply of 3V3 pin.|(% style="width:157px" %)OK
--Device will send an uplink after got this downlink command. With below payload:
++(% style="color:blue" %)**Downlink Command: 0x07**(%%)
++Format: Command Code (0x07) followed by 3 bytes.
--Configures info payload:
++The first byte is 01,the second and third bytes are the time to turn on.
--(% border="1" cellspacing="5" style="background-color:#f2f2f2; width:510px" %)
--|=(% style="background-color:#4F81BD;color:white" %)(((
--**Size(bytes)**
--)))|=(% style="background-color:#4F81BD;color:white" %)**1**|=(% style="background-color:#4F81BD;color:white" %)**1**|=(% style="background-color:#4F81BD;color:white" %)**1**|=(% style="background-color:#4F81BD;color:white" %)**1**|=(% style="background-color:#4F81BD;color:white" %)**1**|=(% style="background-color:#4F81BD;color:white" %)**5**|=(% style="background-color:#4F81BD;color:white" %)**1**
--|**Value**|Software Type|(((
--Frequency Band
--)))|Sub-band|(((
--Firmware Version
--)))|Sensor Type|Reserve|(((
--[[Message Type>>||anchor="H2.3.7MessageType"]]
--Always 0x02
--)))
++* Example 1: Downlink Payload: 07 01 00 00     **~-~-->**   AT+3V3T=0
++* Example 2: Downlink Payload: 07 01 01 F4      **~-~-->**  AT+3V3T=500
--(% style="color:#037691" %)**Software Type**(%%): Always 0x03 for LLDS12
--(% style="color:#037691" %)**Frequency Band**:
--
--*0x01: EU868
--
--*0x02: US915
--
--*0x03: IN865
--
--*0x04: AU915
--
--*0x05: KZ865
--
--*0x06: RU864
--
--*0x07: AS923
--
--*0x08: AS923-1
--
--*0x09: AS923-2
--
--*0xa0: AS923-3
--
--
--(% style="color:#037691" %)**Sub-Band**(%%): value 0x00 ~~ 0x08
--
--(% style="color:#037691" %)**Firmware Version**(%%): 0x0100, Means: v1.0.0 version
--
--(% style="color:#037691" %)**Sensor Type**:
--
--0x01: LSE01
--
--0x02: LDDS75
--
--0x03: LDDS20
--
--0x04: LLMS01
--
--0x05: LSPH01
--
--0x06: LSNPK01
--
--0x07: LLDS12
--
--
  = 4. Battery & Power Consumption =
@@ -812,7 +812,6 @@
  * Update through UART TTL interface: **[[Instruction>>url:http://wiki.dragino.com/xwiki/bin/view/Main/UART%20Access%20for%20LoRa%20ST%20v4%20base%20model/#H1.LoRaSTv4baseHardware]]**.
--
  = 6. FAQ =
  == 6.1 What is the frequency plan for LDS12-LB? ==
@@ -874,7 +874,6 @@
  * (% style="color:red" %)**CN470**(%%): LoRaWAN CN470 band
--
  = 9. Packing Info =
@@ -893,7 +893,6 @@
  * Weight / pcs : g
--
  = 10. Support =

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Author

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