Changes for page LMDS200 -- LoRaWAN Microwave Radar Distance Sensor User Manual
Last modified by Xiaoling on 2025/04/27 16:45
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... ... @@ -3,7 +3,6 @@ 3 3 4 4 **Contents:** 5 5 6 -{{toc/}} 7 7 8 8 9 9 ... ... @@ -11,7 +11,6 @@ 11 11 12 12 13 13 14 - 15 15 = 1. Introduction = 16 16 17 17 == 1.1 What is LoRaWAN Distance Detection Sensor == ... ... @@ -20,51 +20,24 @@ 20 20 21 21 22 22 ((( 23 -((( 24 24 The Dragino LDDS75 is a (% style="color:#4472c4" %)** LoRaWAN Distance Detection Sensor**(%%) for Internet of Things solution. It is used to measure the distance between the sensor and a flat object. The distance detection sensor is a module that uses (% style="color:#4472c4" %)** ultrasonic sensing** (%%)technology for distance measurement, and (% style="color:#4472c4" %)** temperature compensation**(%%) is performed internally to improve the reliability of data. The LDDS75 can be applied to scenarios such as horizontal distance measurement, liquid level measurement, parking management system, object proximity and presence detection, intelligent trash can management system, robot obstacle avoidance, automatic control, sewer, bottom water level monitoring, etc. 25 -))) 26 26 27 -((( 28 - 29 -))) 30 30 31 -((( 32 32 It detects the distance** (% style="color:#4472c4" %) between the measured object and the sensor(%%)**, and uploads the value via wireless to LoRaWAN IoT Server. 33 -))) 34 34 35 -((( 36 - 37 -))) 38 38 39 -((( 40 40 The LoRa wireless technology used in LDDS75 allows device to send data and reach extremely long ranges at low data-rates. It provides ultra-long range spread spectrum communication and high interference immunity whilst minimizing current consumption. 41 -))) 42 42 43 -((( 44 - 45 -))) 46 46 47 -((( 48 48 LDDS75 is powered by (% style="color:#4472c4" %)** 4000mA or 8500mAh Li-SOCI2 battery**(%%); It is designed for long term use up to 10 years*. 49 -))) 50 50 51 -((( 52 - 53 -))) 54 54 55 -((( 56 56 Each LDDS75 pre-loads with a set of unique keys for LoRaWAN registrations, register these keys to local LoRaWAN server and it will auto connect if there is network coverage, after power on. 57 -))) 58 58 59 -((( 60 - 61 -))) 62 62 63 -((( 64 -(% style="color:#4472c4" %) * (%%)Actually lifetime depends on network coverage and uplink interval and other factors. 36 +(% style="color:#4472c4" %) * (%%)Actually lifetime depends on network coverage and uplink interval and other factors 65 65 ))) 66 66 ))) 67 -))) 68 68 69 69 70 70 [[image:1654847051249-359.png]] ... ... @@ -93,12 +93,12 @@ 93 93 94 94 [[image:image-20220610154839-1.png]] 95 95 96 -((( 97 -**Remarks: (1) a. When the ambient temperature is 0-39 ℃, the maximum humidity is 90% (non-condensing); b. When the ambient temperature is 40-50 ℃, the highest humidity is the highest humidity in the natural world at the current temperature (no condensation)** 98 -))) 67 +**Remarks: (1) a. When the ambient temperature is 0-39 ℃, the maximum humidity is 90% (non-condensing);** 99 99 69 +**b. When the ambient temperature is 40-50 ℃, the highest humidity is the highest humidity in the natural world at the current temperature (no condensation)** 100 100 101 101 72 + 102 102 === 1.3.2 Effective measurement range Reference beam pattern === 103 103 104 104 **(1) The tested object is a white cylindrical tube made of PVC, with a height of 100cm and a diameter of 7.5cm.** ... ... @@ -108,10 +108,7 @@ 108 108 [[image:1654852253176-749.png]] 109 109 110 110 111 - 112 -((( 113 113 **(2)** **The object to be tested is a "corrugated cardboard box" perpendicular to the central axis of 0 °, and the length * width is 60cm * 50cm.** 114 -))) 115 115 116 116 117 117 [[image:1654852175653-550.png]](% style="display:none" %) ** ** ... ... @@ -131,7 +131,6 @@ 131 131 * Bottom water level monitoring 132 132 133 133 134 - 135 135 == 1.6 Pin mapping and power on == 136 136 137 137 ... ... @@ -178,17 +178,11 @@ 178 178 [[image:image-20220607170145-1.jpeg]] 179 179 180 180 181 -((( 182 182 For OTAA registration, we need to set **APP EUI/ APP KEY/ DEV EUI**. Some server might no need to set APP EUI. 183 -))) 184 184 185 -((( 186 186 Enter these keys in the LoRaWAN Server portal. Below is TTN V3 screen shot: 187 -))) 188 188 189 -((( 190 190 **Add APP EUI in the application** 191 -))) 192 192 193 193 [[image:image-20220610161353-4.png]] 194 194 ... ... @@ -231,15 +231,11 @@ 231 231 == 2.3 Uplink Payload == 232 232 233 233 ((( 234 -((( 235 235 LDDS75 will uplink payload via LoRaWAN with below payload format: 236 -))) 237 237 238 -((( 239 239 Uplink payload includes in total 4 bytes. 240 240 Payload for firmware version v1.1.4. . Before v1.1.3, there is on two fields: BAT and Distance 241 241 ))) 242 -))) 243 243 244 244 ((( 245 245 ... ... @@ -250,12 +250,12 @@ 250 250 **Size (bytes)** 251 251 )))|=(% style="width: 62.5px;" %)**2**|=**2**|=1|=2|=**1** 252 252 |(% style="width:62.5px" %)**Value**|(% style="width:62.5px" %)[[BAT>>||anchor="H2.3.1A0BatteryInfo"]]|((( 253 -[[Distance>>||anchor="H2.3. 2A0Distance"]]210 +[[Distance>>||anchor="H2.3.3A0Distance"]] 254 254 255 255 (unit: mm) 256 -)))|[[Digital Interrupt (Optional)>>||anchor="H2.3. 3A0InterruptPin"]]|(((257 -[[Temperature (Optional )>>||anchor="H2.3. 4A0DS18B20Temperaturesensor"]]258 -)))|[[Sensor Flag>> ||anchor="H2.3.5A0SensorFlag"]]213 +)))|[[Digital Interrupt (Optional)>>||anchor="H2.3.4A0Distancesignalstrength"]]|((( 214 +[[Temperature (Optional )>>||anchor="H2.3.5A0InterruptPin"]] 215 +)))|[[Sensor Flag>>path:#Sensor_Flag]] 259 259 260 260 [[image:1654850511545-399.png]] 261 261 ... ... @@ -274,21 +274,18 @@ 274 274 275 275 === 2.3.2 Distance === 276 276 277 -((( 278 278 Get the distance. Flat object range 280mm - 7500mm. 279 -))) 280 280 281 -((( 282 282 For example, if the data you get from the register is 0x0B 0x05, the distance between the sensor and the measured object is(% style="color:#4472c4" %)** 0B05(H) = 2821 (D) = 2821 mm.** 283 -))) 284 284 285 285 286 286 * If the sensor value is 0x0000, it means system doesn’t detect ultrasonic sensor. 287 287 * If the sensor value lower than 0x0118 (280mm), the sensor value will be invalid. Since v1.1.4, all value lower than 280mm will be set to 0x0014(20mm) which means the value is invalid. 288 288 242 + 289 289 === 2.3.3 Interrupt Pin === 290 290 291 -This data field shows if this packet is generated by interrupt or not. [[Click here>>||anchor="H 3.3A0SetInterruptMode"]] for the hardware and software set up.245 +This data field shows if this packet is generated by interrupt or not. [[Click here>>||anchor="H4.2A0SetInterruptMode"]] for the hardware and software set up. 292 292 293 293 **Example:** 294 294 ... ... @@ -319,9 +319,9 @@ 319 319 0x00: No Ultrasonic Sensor 320 320 321 321 276 +=== 277 +(% style="color:inherit; font-family:inherit" %)2.3.6 Decode payload in The Things Network(%%) === 322 322 323 -=== 2.3.6 Decode payload in The Things Network === 324 - 325 325 While using TTN network, you can add the payload format to decode the payload. 326 326 327 327 ... ... @@ -855,6 +855,7 @@ 855 855 * Solid ON for 5 seconds once device successful Join the network. 856 856 * Blink once when device transmit a packet. 857 857 812 + 858 858 == 2.8 Firmware Change Log == 859 859 860 860 ... ... @@ -870,13 +870,11 @@ 870 870 871 871 [[image:image-20220610172003-1.png]] 872 872 873 - 874 874 [[image:image-20220610172003-2.png]] 875 875 876 876 831 +== 2.10 Battery Analysis == 877 877 878 -== 2.10 Battery Analysis == 879 - 880 880 === 2.10.1 Battery Type === 881 881 882 882 The LDDS75 battery is a combination of a 4000mAh or 8500mAh Li/SOCI2 Battery and a Super Capacitor. The battery is non-rechargeable battery type with a low discharge rate (<2% per year). This type of battery is commonly used in IoT devices such as water meter. ... ... @@ -885,7 +885,7 @@ 885 885 The battery related documents as below: 886 886 887 887 * ((( 888 -[[Battery Dimension>>url:http://www.dragino.com/downloads/index.php?dir=datasheet/Battery/&file=LSN50-Battery-Dimension.pdf]], 841 +[[ Battery Dimension>>url:http://www.dragino.com/downloads/index.php?dir=datasheet/Battery/&file=LSN50-Battery-Dimension.pdf]], 889 889 ))) 890 890 * ((( 891 891 [[Lithium-Thionyl Chloride Battery datasheet>>url:https://www.dragino.com/downloads/downloads/datasheet/Battery/ER26500/ER26500_Datasheet-EN.pdf]], ... ... @@ -901,7 +901,7 @@ 901 901 === 2.10.2 Replace the battery === 902 902 903 903 ((( 904 -You can change the battery in the LDDS75.The type of battery is not limited as long as the output is between 3v to 3.6v. On the main board, there is a diode (D1) between the battery and the main circuit. If you need to use a battery with less than 3.3v, please remove the D1 and shortcut the two pads of it so there won 't be voltage drop between battery and main board.857 +You can change the battery in the LDDS75.The type of battery is not limited as long as the output is between 3v to 3.6v. On the main board, there is a diode (D1) between the battery and the main circuit. If you need to use a battery with less than 3.3v, please remove the D1 and shortcut the two pads of it so there won’t be voltage drop between battery and main board. 905 905 ))) 906 906 907 907 ((( ... ... @@ -909,12 +909,12 @@ 909 909 ))) 910 910 911 911 ((( 912 -The default battery pack of LDDS75 includes a ER18505 plus super capacitor. If user can 't find this pack locally, they can find ER18505 or equivalence, which will also work in most case. The SPC can enlarge the battery life for high frequency use (update period below 5 minutes)865 +The default battery pack of LDDS75 includes a ER18505 plus super capacitor. If user can’t find this pack locally, they can find ER18505 or equivalence, which will also work in most case. The SPC can enlarge the battery life for high frequency use (update period below 5 minutes) 913 913 ))) 914 914 915 915 916 916 917 -= 3. Configure LD DS75via AT Command or LoRaWAN Downlink =870 += 3. Configure LLDS12 via AT Command or LoRaWAN Downlink = 918 918 919 919 ((( 920 920 ((( ... ... @@ -924,7 +924,7 @@ 924 924 925 925 * ((( 926 926 ((( 927 -AT Command Connection: See [[FAQ>>||anchor="H 4.A0FAQ"]].880 +AT Command Connection: See [[FAQ>>||anchor="H7.A0FAQ"]]. 928 928 ))) 929 929 ))) 930 930 * ((( ... ... @@ -1021,6 +1021,8 @@ 1021 1021 [[image:image-20220610173409-7.png]] 1022 1022 1023 1023 977 + 978 + 1024 1024 ((( 1025 1025 (% style="color:#037691" %)**Downlink Command: 0x01** 1026 1026 ))) ... ... @@ -1043,12 +1043,13 @@ 1043 1043 1044 1044 Feature, Set Interrupt mode for GPIO_EXIT. 1045 1045 1001 + 1046 1046 (% style="color:#037691" %)**Downlink Command: AT+INTMOD** 1047 1047 1048 -[[image:image-202206101 74917-9.png]]1004 +[[image:image-20220610105907-1.png]] 1049 1049 1050 1050 1051 - (% style="color:#037691" %)**Downlink Command: 0x06**1007 +**Downlink Command: 0x06** 1052 1052 1053 1053 Format: Command Code (0x06) followed by 3 bytes. 1054 1054 ... ... @@ -1057,71 +1057,203 @@ 1057 1057 * Example 1: Downlink Payload: 06000000 ~/~/ Turn off interrupt mode 1058 1058 * Example 2: Downlink Payload: 06000003 ~/~/ Set the interrupt mode to rising edge trigger 1059 1059 1060 -= 4. FAQ = 1061 1061 1062 -== 4.1 What is the frequency plan for LDDS75? == 1063 1063 1064 - LDDS75usethesame frequencyasotherDraginoproducts. User can see the detailfrom this link: [[Introduction>>doc:Main.End DeviceFrequency Band.WebHome||anchor="H1.Introduction"]]1018 += 5. Battery & How to replace = 1065 1065 1020 +== 5.1 Battery Type == 1066 1066 1022 +((( 1023 +LLDS12 is equipped with a [[8500mAH ER26500 Li-SOCI2 battery>>url:https://www.dragino.com/downloads/index.php?dir=datasheet/Battery/ER26500/]]. The battery is un-rechargeable battery with low discharge rate targeting for 8~~10 years use. This type of battery is commonly used in IoT target for long-term running, such as water meter. 1024 +))) 1067 1067 1068 -== 4.2 How to change the LoRa Frequency Bands/Region == 1026 +((( 1027 +The discharge curve is not linear so can’t simply use percentage to show the battery level. Below is the battery performance. 1028 +))) 1069 1069 1070 -You can follow the instructions for [[how to upgrade image>>||anchor="H2.8A0200BFirmwareChangeLog"]]. 1071 -When downloading the images, choose the required image file for download. 1030 +[[image:1654593587246-335.png]] 1072 1072 1073 1073 1033 +Minimum Working Voltage for the LLDS12: 1074 1074 1075 - == 4.3 Can I useLDDS75incondensation environment? ==1035 +LLDS12: 2.45v ~~ 3.6v 1076 1076 1077 -LDDS75 is not suitable to be used in condensation environment. Condensation on the LDDS75 probe will affect the reading and always got 0. 1078 1078 1079 1079 1039 +== 5.2 Replace Battery == 1080 1080 1081 -= 5. Trouble Shooting = 1041 +((( 1042 +Any battery with range 2.45 ~~ 3.6v can be a replacement. We recommend to use Li-SOCl2 Battery. 1043 +))) 1082 1082 1083 -== 5.1 Why I can’t join TTN V3 in US915 / AU915 bands? == 1045 +((( 1046 +And make sure the positive and negative pins match. 1047 +))) 1084 1084 1085 -It is due to channel mapping. Please see below link: [[Frequency band>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H2.NoticeofUS9152FCN4702FAU915Frequencyband"]] 1086 1086 1087 1087 1088 -== 5. 2ATCommand inputdoesn'twork==1051 +== 5.3 Power Consumption Analyze == 1089 1089 1053 +((( 1054 +Dragino Battery powered product are all runs in Low Power mode. We have an update battery calculator which base on the measurement of the real device. User can use this calculator to check the battery life and calculate the battery life if want to use different transmit interval. 1055 +))) 1056 + 1057 +((( 1058 +Instruction to use as below: 1059 +))) 1060 + 1061 + 1062 +**Step 1**: Downlink the up-to-date DRAGINO_Battery_Life_Prediction_Table.xlsx from: 1063 + 1064 +[[https:~~/~~/www.dragino.com/downloads/index.pHp?dir=LoRa_End_Node/Battery_Analyze/>>url:https://www.dragino.com/downloads/index.php?dir=LoRa_End_Node/Battery_Analyze/]] 1065 + 1066 + 1067 +**Step 2**: Open it and choose 1068 + 1069 +* Product Model 1070 +* Uplink Interval 1071 +* Working Mode 1072 + 1073 +And the Life expectation in difference case will be shown on the right. 1074 + 1075 +[[image:1654593605679-189.png]] 1076 + 1077 + 1078 +The battery related documents as below: 1079 + 1080 +* ((( 1081 +[[Battery Dimension>>url:http://www.dragino.com/downloads/index.php?dir=datasheet/Battery/&file=LSN50-Battery-Dimension.pdf]], 1082 +))) 1083 +* ((( 1084 +[[Lithium-Thionyl Chloride Battery datasheet>>url:https://www.dragino.com/downloads/downloads/datasheet/Battery/ER26500/ER26500_Datasheet-EN.pdf]], 1085 +))) 1086 +* ((( 1087 +[[Lithium-ion Battery-Capacitor datasheet>>url:http://www.dragino.com/downloads/downloads/datasheet/Battery/SPC_1520_datasheet.jpg]], [[Tech Spec>>url:http://www.dragino.com/downloads/downloads/datasheet/Battery/SPC1520%20Technical%20Specification20171123.pdf]] 1088 +))) 1089 + 1090 +[[image:image-20220607172042-11.png]] 1091 + 1092 + 1093 + 1094 +=== 5.3.1 Battery Note === 1095 + 1096 +((( 1097 +The Li-SICO battery is designed for small current / long period application. It is not good to use a high current, short period transmit method. The recommended minimum period for use of this battery is 5 minutes. If you use a shorter period time to transmit LoRa, then the battery life may be decreased. 1098 +))) 1099 + 1100 + 1101 + 1102 +=== 5.3.2 Replace the battery === 1103 + 1104 +((( 1105 +You can change the battery in the LLDS12.The type of battery is not limited as long as the output is between 3v to 3.6v. On the main board, there is a diode (D1) between the battery and the main circuit. If you need to use a battery with less than 3.3v, please remove the D1 and shortcut the two pads of it so there won’t be voltage drop between battery and main board. 1106 +))) 1107 + 1108 +((( 1109 +The default battery pack of LLDS12 includes a ER26500 plus super capacitor. If user can’t find this pack locally, they can find ER26500 or equivalence, which will also work in most case. The SPC can enlarge the battery life for high frequency use (update period below 5 minutes) 1110 +))) 1111 + 1112 + 1113 + 1114 += 6. Use AT Command = 1115 + 1116 +== 6.1 Access AT Commands == 1117 + 1118 +LLDS12 supports AT Command set in the stock firmware. You can use a USB to TTL adapter to connect to LLDS12 for using AT command, as below. 1119 + 1120 +[[image:1654593668970-604.png]] 1121 + 1122 +**Connection:** 1123 + 1124 +(% style="background-color:yellow" %)** USB TTL GND <~-~-~-~-> GND** 1125 + 1126 +(% style="background-color:yellow" %)** USB TTL TXD <~-~-~-~-> UART_RXD** 1127 + 1128 +(% style="background-color:yellow" %)** USB TTL RXD <~-~-~-~-> UART_TXD** 1129 + 1130 + 1131 +((( 1132 +((( 1133 +In the PC, you need to set the serial baud rate to (% style="color:green" %)**9600**(%%) to access the serial console for LLDS12. 1134 +))) 1135 + 1136 +((( 1137 +LLDS12 will output system info once power on as below: 1138 +))) 1139 +))) 1140 + 1141 + 1142 + [[image:1654593712276-618.png]] 1143 + 1144 +Valid AT Command please check [[Configure Device>>||anchor="H4.A0ConfigureLLDS12viaATCommandorLoRaWANDownlink"]]. 1145 + 1146 + 1147 += 7. FAQ = 1148 + 1149 +== 7.1 How to change the LoRa Frequency Bands/Region == 1150 + 1151 +You can follow the instructions for [[how to upgrade image>>||anchor="H2.8A0200BFirmwareChangeLog"]]. 1152 +When downloading the images, choose the required image file for download. 1153 + 1154 + 1155 += 8. Trouble Shooting = 1156 + 1157 +== 8.1 AT Commands input doesn’t work == 1158 + 1159 + 1160 +((( 1090 1090 In the case if user can see the console output but can’t type input to the device. Please check if you already include the (% style="color:green" %)**ENTER**(%%) while sending out the command. Some serial tool doesn’t send (% style="color:green" %)**ENTER**(%%) while press the send key, user need to add ENTER in their string. 1162 +))) 1091 1091 1164 + 1165 +== 8.2 Significant error between the output distant value of LiDAR and actual distance == 1166 + 1167 + 1092 1092 ((( 1169 +(% style="color:blue" %)**Cause ①**(%%)**:**Due to the physical principles of The LiDAR probe, the above phenomenon is likely to occur if the detection object is the material with high reflectivity (such as mirror, smooth floor tile, etc.) or transparent substance (such as glass and water, etc.) 1170 +))) 1171 + 1172 +((( 1173 +Troubleshooting: Please avoid use of this product under such circumstance in practice. 1174 +))) 1175 + 1176 +((( 1093 1093 1094 1094 ))) 1095 1095 1180 +((( 1181 +(% style="color:blue" %)**Cause ②**(%%)**: **The IR-pass filters are blocked. 1182 +))) 1096 1096 1097 -= 6. Order Info = 1184 +((( 1185 +Troubleshooting: please use dry dust-free cloth to gently remove the foreign matter. 1186 +))) 1098 1098 1099 1099 1100 -Part Number **:** (% style="color:blue" %)**LDDS75-XX-YY** 1101 1101 1190 += 9. Order Info = 1102 1102 1103 -(% style="color:blue" %)**XX**(%%)**: **The default frequency band 1104 1104 1105 -* (% style="color:red" %)**AS923 **(%%)**:** LoRaWAN AS923 band 1106 -* (% style="color:red" %)**AU915 **(%%)**:** LoRaWAN AU915 band 1107 -* (% style="color:red" %)**EU433 **(%%)**:** LoRaWAN EU433 band 1108 -* (% style="color:red" %)**EU868 **(%%)**:** LoRaWAN EU868 band 1109 -* (% style="color:red" %)**KR920 **(%%)**:** LoRaWAN KR920 band 1110 -* (% style="color:red" %)**US915 **(%%)**:** LoRaWAN US915 band 1111 -* (% style="color:red" %)**IN865 **(%%)**:** LoRaWAN IN865 band 1112 -* (% style="color:red" %)**CN470 **(%%)**:** LoRaWAN CN470 band 1193 +Part Number: (% style="color:blue" %)**LLDS12-XX** 1113 1113 1114 -(% style="color:blue" %)**YY**(%%): Battery Option 1115 1115 1116 -* (% style="color:red" %)**4 **(%%)**: **4000mAh battery 1117 -* (% style="color:red" %)**8 **(%%)**:** 8500mAh battery 1196 +(% style="color:blue" %)**XX**(%%): The default frequency band 1118 1118 1119 -= 7. Packing Info = 1198 +* (% style="color:red" %)**AS923**(%%): LoRaWAN AS923 band 1199 +* (% style="color:red" %)**AU915**(%%): LoRaWAN AU915 band 1200 +* (% style="color:red" %)**EU433**(%%): LoRaWAN EU433 band 1201 +* (% style="color:red" %)**EU868**(%%): LoRaWAN EU868 band 1202 +* (% style="color:red" %)**KR920**(%%): LoRaWAN KR920 band 1203 +* (% style="color:red" %)**US915**(%%): LoRaWAN US915 band 1204 +* (% style="color:red" %)**IN865**(%%): LoRaWAN IN865 band 1205 +* (% style="color:red" %)**CN470**(%%): LoRaWAN CN470 band 1120 1120 1207 += 10. Packing Info = 1121 1121 1209 + 1122 1122 **Package Includes**: 1123 1123 1124 -* LD DS75LoRaWAN DistanceDetectionSensor x 11212 +* LLDS12 LoRaWAN LiDAR Distance Sensor x 1 1125 1125 1126 1126 **Dimension and weight**: 1127 1127 ... ... @@ -1130,7 +1130,7 @@ 1130 1130 * Package Size / pcs : cm 1131 1131 * Weight / pcs : g 1132 1132 1133 -= 8. Support =1221 += 11. Support = 1134 1134 1135 1135 * Support is provided Monday to Friday, from 09:00 to 18:00 GMT+8. Due to different timezones we cannot offer live support. However, your questions will be answered as soon as possible in the before-mentioned schedule. 1136 1136 * Provide as much information as possible regarding your enquiry (product models, accurately describe your problem and steps to replicate it etc) and send a mail to [[support@dragino.com>>url:http://../../../../../../D:%5C%E5%B8%82%E5%9C%BA%E8%B5%84%E6%96%99%5C%E8%AF%B4%E6%98%8E%E4%B9%A6%5CLoRa%5CLT%E7%B3%BB%E5%88%97%5Csupport@dragino.com]].
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