Skip to Content
Last modified by Mengting Qiu on 2025/06/04 10:46
From version 270.1
edited by Xiaoling
on 2022/06/23 11:44
Change comment: Uploaded new attachment "image-20220623114454-1.png", version {1}
To version 264.2
edited by Xiaoling
on 2022/06/23 10:04
Change comment: There is no comment for this version

Summary

Details

Page properties
Content
... ... @@ -1,8 +1,13 @@
1 -[[image:image-20220623113318-1.jpeg||height="465" width="465"]](% style="display:none" %) (%%) [[image:image-20220623113318-2.png||height="320" width="502"]] (% style="display:none" %)
1 +(% aria-label="image-20220611143226-1.png image widget" contenteditable="false" role="region" tabindex="-1" %)
2 +(((
3 +(% style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220,220,220,0.5); display:none" %)[[image:data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==||height="15" role="presentation" title="Click and drag to move" width="15"]]
4 +)))
2 2  
3 - [[image:image-20220623113318-3.png||height="319" width="490"]](% style="display:none" %)
6 +(% style="text-align:center" %)
7 +[[image:1655887486036-943.png||height="322" width="322"]]
4 4  
5 5  
10 + [[image:1655887552639-376.png]] [[image:1655887744989-319.png]]
6 6  
7 7  
8 8  
... ... @@ -13,8 +13,6 @@
13 13  
14 14  **Table of Contents:**
15 15  
16 -{{toc/}}
17 -
18 18  (% aria-label="macro:toc widget" contenteditable="false" role="region" tabindex="-1" %)
19 19  (((
20 20  (% style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220,220,220,0.5); display:none" %)[[image:data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==||height="15" role="presentation" title="Click and drag to move" width="15"]]
... ... @@ -33,29 +33,17 @@
33 33  == 1.1 ​ What is LSN50V2-D2x LoRaWAN Temperature Sensor ==
34 34  
35 35  
36 -(((
37 37  The Dragino LSN50v2-D2x is a (% style="color:#4472c4" %)**LoRaWAN Temperature Sensor**(%%) for Internet of Things solution. It can be used to measure the (% style="color:#4472c4" %)**temperature of air, liquid or object**(%%), and then upload to IoT server via LoRaWAN wireless protocol.
38 -)))
39 39  
40 -(((
41 41  The temperature sensor used in LSN50v2-D2x can (% style="color:#4472c4" %)**measure -55°C ~~ 125°C with accuracy ±0.5°C (max ±2.0 °C)**.
42 -)))
43 43  
44 -(((
45 45  LSN50v2-D2x supports (% style="color:#4472c4" %)**temperature alarm feature,**(%%) user can set temperature alarm for instant notice.
46 -)))
47 47  
48 -(((
49 49  LSN50v2-D2x has max 3 probes which measure maximum 3 temperature points.
50 -)))
51 51  
52 -(((
53 53  LSN50v2-D2x is powered by (% style="color:#4472c4" %)**8500mAh Li-SOCI2 battery**(%%), it is designed for long term use up to 10 years. (Actually Battery life depends on the use environment, update period. Please check related Power Analyze report).
54 -)))
55 55  
56 -(((
57 57  Each LSN50v2-D2x is pre-load with a set of unique keys for LoRaWAN registration, register these keys to local LoRaWAN server and it will auto connect after power on.
58 -)))
59 59  
60 60  
61 61  [[image:1655889313568-879.png]]
... ... @@ -64,7 +64,6 @@
64 64  
65 65  == 1.2  Specifications ==
66 66  
67 -
68 68  (% style="color:#037691" %)**Common DC Characteristics:**
69 69  
70 70  * Supply Voltage: built in 8500mAh Li-SOCI2 battery
... ... @@ -94,7 +94,6 @@
94 94  * Sleeping Mode: 20uA
95 95  * LoRaWAN Transmit Mode: 125mA @ 20dBm 44mA @ 14dBm
96 96  
97 -
98 98  == ​1.3  Features ==
99 99  
100 100  * LoRaWAN v1.0.3 Class A
... ... @@ -153,7 +153,6 @@
153 153  Cable Drawing: [[See This Link>>url:https://www.dragino.com/downloads/index.php?dir=LoRa_End_Node/LSN50v2-D20/Cable_Drawing/&file=CAB0-35IC-K31G-210811.pdf]]
154 154  )))
155 155  
156 -
157 157  == 1.6  Pin Definitions and Switch ==
158 158  
159 159  (% class="wikigeneratedid" %)
... ... @@ -189,7 +189,6 @@
189 189  1. When boot the device in flash mode
190 190  1. Send an uplink packet
191 191  
192 -
193 193  == 1.7  Hardware Change log ==
194 194  
195 195  LSN50v2-D20 v1.0:  Release.
... ... @@ -211,7 +211,7 @@
211 211  (((
212 212  Here is an example for how to join the [[TTN LoRaWAN >>url:http://www.thethingsnetwork.org/]]Server. Below is the network structure, in this demo we use [[DLOS8>>url:http://www.dragino.com/products/lora-lorawan-gateway/item/160-dlos8.html]] as LoRaWAN gateway.
213 213  
214 -(% style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220,220,220,0.5); display:none" %)[[image:data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==||draggable="true" height="15" role="presentation" title="Click and drag to move" width="15"]][[image:1655891470063-521.png]](% title="Click and drag to resize" %)​[[image:1655952600869-544.png]]
201 +(% style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220,220,220,0.5); display:none" %)[[image:data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==||draggable="true" height="15" role="presentation" title="Click and drag to move" width="15"]][[image:1655891470063-521.png]](% title="Click and drag to resize" %)​
215 215  )))
216 216  
217 217  (% title="Click and drag to resize" %)​(% aria-label="Data URI image image widget" contenteditable="false" role="region" style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220, 220, 220, 0.5); display:none" tabindex="-1" %)[[image:data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==||data-widget="image" draggable="true" height="15" role="presentation" title="Click and drag to move" width="15"]][[image:data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==||draggable="true" height="15" role="presentation" title="Click and drag to move" width="15"]](% title="Click and drag to resize" %)​(% aria-label="Data URI image image widget" contenteditable="false" role="region" style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220,220,220,0.5); display:none" tabindex="-1" %)​(%%)​
... ... @@ -289,22 +289,22 @@
289 289  )))
290 290  
291 291  
292 -(% border="1" cellspacing="10" style="background-color:#ffffcc; color:green; width:500px" %)
279 +(% border="1" cellspacing="10" style="background-color:#ffffcc; color:green; width:709px" %)
293 293  |=(% style="width: 62.5px;" %)(((
294 294  **Size (bytes)**
295 -)))|=(% style="width: 60px;" %)2|=(% style="width: 120px;" %)2|=(% style="width: 60px;" %)2|=(% style="width: 65px;" %)1|=(% style="width: 65px;" %)**2**|=(% style="width: 65px;" %)2
296 -|(% style="width:65px" %)**Value**|(((
297 -[[Battery>>||anchor="HBattery:"]]
298 -)))|(% style="width:91px" %)(((
299 -[[Temp_ Red or Temp _White>>||anchor="HTemperatureREDorTemperatureWhite:"]]
300 -)))|(% style="width:61px" %)(((
282 +)))|=(% style="width: 62.5px;" %)2|=(% style="width: 200px;" %)2|=(% style="width: 82px;" %)2|=(% style="width: 91px;" %)1|=(% style="width: 102px;" %)**2**|=(% style="width: 95px;" %)2
283 +|(% style="width:62.5px" %)**Value**|(((
284 +[[Battery>>||anchor="H2.4.1A0BatteryInfo"]][[ >>||anchor="H2.4.2A0InterruptPin"]]
285 +)))|(% style="width:200px" %)(((
286 +[[Temp_ Red or Temp _White>>||anchor="H2.4.3A0Distance"]]
287 +)))|(% style="width:82px" %)(((
301 301  ignore
302 302  )))|(% style="width:91px" %)(((
303 -[[Alarm Flag>>||anchor="HAlarmFlag26MOD:"]]
304 -)))|(% style="width:99px" %)(((
305 -[[Temp_White>>||anchor="HTemperatureWhite:"]]
306 -)))|(% style="width:97px" %)(((
307 -[[Temp_Black>>||anchor="HTemperatureBlack:"]]
290 +[[Alarm Flag>>||anchor="H2.4.3A0Distance"]]
291 +)))|(% style="width:102px" %)(((
292 +[[Temp_White>>||anchor="H2.4.3A0Distance"]]
293 +)))|(% style="width:95px" %)(((
294 +[[Temp_Black>>||anchor="H2.4.4A0MessageType"]]
308 308  )))
309 309  
310 310  [[image:image-20220622180351-1.png||height="589" width="1096"]]
... ... @@ -365,9 +365,20 @@
365 365  
366 366  If payload >> 2 = 0x00  **~-~->**  means MOD=1, This is a sampling uplink message
367 367  
368 -If payload >> 2 = 0x31  **~-~->**  means MOD=31, this message is a reply message for polling, this message contains the alarm settings. see [[~>url:http:~~/~~/www.dragino.com/downloads/index.php?dir" data-cke-saved-href="#HPolltheAlarmsettings:" href="#HPolltheAlarmsettings:"~>this link>>||anchor="HPolltheAlarmsettings:" aria-label="Data URI image image widget" contenteditable="false" role="presentation" style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220,220,220,0.5); display:none" tabindex="-1"]]
355 +If payload >> 2 = 0x31  **~-~->**  means MOD=31, this message is a reply message for polling, this message contains the alarm settings. see [[this link>>path:#Poll_Alarm]] for detail.
369 369  
357 +(% aria-label="Data URI image image widget" contenteditable="false" role="region" style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220,220,220,0.5); display:none" tabindex="-1" %)[[image:data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==||data-widget="image" draggable="true" height="15" role="presentation" title="Click and drag to move" width="15"]][[image:data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==||draggable="true" height="15" role="presentation" title="Click and drag to move" width="15"]](% title="Click and drag to resize" %)​
370 370  
359 +
360 +=== 2.3.2  Decode payload in The Things Network ===
361 +
362 +In TTN, use can add a custom payload so it shows friendly. 
363 +
364 +In the page Applications ~-~-> Payload Formats ~-~-> Custom ~-~-> decoder to add the decoder from:
365 +
366 +[[http:~~/~~/www.dragino.com/downloads/index.php?dir=LoRa_End_Node/LSN50v2-D20/Decoder/>>url:http://www.dragino.com/downloads/index.php?dir=LoRa_End_Node/LSN50v2-D20/Decoder/]]
367 +
368 +
371 371  (% aria-label="Data URI image image widget" contenteditable="false" role="region" style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220,220,220,0.5); display:none" tabindex="-1" %)[[image:data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==||data-widget="image" draggable="true" height="15" role="presentation" title="Click and drag to move" width="15"]](% aria-label="Data URI image image widget" contenteditable="false" role="region" style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220, 220, 220, 0.5); display:none" tabindex="-1" %)[[image:data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==||draggable="true" height="15" role="presentation" title="Click and drag to move" width="15"]](% aria-label="Data URI image image widget" contenteditable="false" role="region" style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220,220,220,0.5); display:none" tabindex="-1" title="Click and drag to resize" %)​(% aria-label="Data URI image image widget" contenteditable="false" role="region" style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220,220,220,0.5); display:none" tabindex="-1" %)[[image:data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==||data-widget="image" draggable="true" height="15" role="presentation" title="Click and drag to move" width="15"]](% aria-label="Data URI image image widget" contenteditable="false" role="region" style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220, 220, 220, 0.5); display:none" tabindex="-1" %)[[image:data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==||draggable="true" height="15" role="presentation" title="Click and drag to move" width="15"]](% aria-label="Data URI image image widget" contenteditable="false" role="region" style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220,220,220,0.5); display:none" tabindex="-1" title="Click and drag to resize" %)​
372 372  
373 373  == 2.4  Temperature Alarm Feature ==
... ... @@ -393,7 +393,7 @@
393 393  LSN50V2-D20 supports configuration via LoRaWAN downlink command or AT Commands.
394 394  
395 395  * Downlink command instructions for different platform: [[Use Note for Server>>doc:Main.WebHome]](IoT LoRaWAN Server)
396 -* AT Command Access Instructions: [[LINK>>||anchor="H4.A0UseATCommand"]]
394 +* AT Command Access Instructions: [[LINK>>path:#AT_Command]]
397 397  
398 398  There are two parts of commands: General one and Special for this model.
399 399  
... ... @@ -412,6 +412,7 @@
412 412  
413 413  === 2.5.2 Sensor related commands ===
414 414  
413 +(% class="wikigeneratedid" %)
415 415  ==== ====
416 416  
417 417  ==== (% style="color:red" %)**Set Alarm Threshold:**(%%) ====
... ... @@ -424,6 +424,7 @@
424 424  * When min≠0, and max=0, Alarm trigger when lower than min
425 425  * When min≠0 and max≠0, Alarm trigger when higher than max or lower than min
426 426  
426 +
427 427  **Example:**
428 428  
429 429   AT+18ALARM=-10,30  ~/~/ Alarm when < -10 or higher than 30.
... ... @@ -446,6 +446,7 @@
446 446  * 2: Temperature_White
447 447  * 3: Temperature_Black
448 448  
449 +
449 449  **Example:**
450 450  
451 451   AT+18ALARM=-10,30,1   ~/~/ Alarm when temperature_red < -10 or higher than 30.
... ... @@ -493,7 +493,6 @@
493 493  
494 494  
495 495  
496 -
497 497  == 2.6  LED Status ==
498 498  
499 499  LSN50-v2-D20 has an internal LED, it will active in below situation:
... ... @@ -642,57 +642,61 @@
642 642  
643 643  = 5.  FAQ =
644 644  
645 -== 5.1 What is the frequency range of LSN50v2-D20? ==
646 646  
646 +1.
647 +11. What is the frequency range of LSN50v2-D20?
648 +
647 647  Different LSN50V2-D20 version supports different frequency range, below is the table for the working frequency and recommend bands for each model:
648 648  
649 649  [[image:image-20220623100350-8.png]]
650 650  
651 651  
652 -== 5.2 What is the Frequency Plan? ==
654 +1.
655 +11. What is the Frequency Plan?
653 653  
654 -Please refer Dragino End Node Frequency Plan:  [[End Device Frequency Band>>doc:Main.End Device Frequency Band.WebHome]]
655 655  
658 +Please refer Dragino End Node Frequency Plan:
656 656  
660 +[[http:~~/~~/wiki.dragino.com/index.php?title=End_Device_Frequency_Band>>url:http://wiki.dragino.com/index.php?title=End_Device_Frequency_Band]]
657 657  
658 -== 5.3 How to update the firmware? ==
659 659  
660 -User can upgrade the firmware for:
661 661  
662 -* (((
663 -Support new features
664 -)))
665 -* (((
666 -For bug fix
667 -)))
668 -* (((
669 -Change LoRaWAN bands.
670 -)))
664 +1.
665 +11. How to update the firmware?
671 671  
672 -Please see this link for how to upgrade: ** **[[Firmware Upgrade Instruction>>doc:Main.Firmware Upgrade Instruction for STM32 base products.WebHome]]
667 +User can upgrade the firmware for 1) bug fix, 2) new feature release or 3) change frequency plan.
673 673  
669 +Please see this link for how to upgrade:
674 674  
671 +[[http:~~/~~/wiki.dragino.com/index.php?title=Firmware_Upgrade_Instruction_for_STM32_base_products#Hardware_Upgrade_Method_Support_List>>url:http://wiki.dragino.com/index.php?title=Firmware_Upgrade_Instruction_for_STM32_base_products#Hardware_Upgrade_Method_Support_List]]
675 675  
676 -= 6.  Trouble Shooting =
673 +== 6.1  How to change the LoRa Frequency Bands/Region ==
677 677  
678 -== 6.1  AT Command input doesn't work ==
675 +You can follow the instructions for [[how to upgrade image>>||anchor="H2.9A0200BFirmwareChangeLog"]].
676 +When downloading the images, choose the required image file for download. ​
679 679  
680 -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.
681 681  
682 682  
680 += 7.  Trouble Shooting =
683 683  
684 -= 7.  Order Info =
682 +== 7.1  AT Command input doesn't work ==
685 685  
684 +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.
686 686  
687 -**Part Number:** (% style="color:blue" %)**LSN50V2-D20-XXX (Signal Probe)**
686 +(((
687 +
688 +)))
688 688  
689 -**~ Or (% style="color:blue" %)LSN50V2-D22-XXX (Dual Probe)(%%)**
690 690  
691 -**~ Or (% style="color:blue" %)LSN50V2-D23-XXX (Triple Probe)(%%)**
691 += 8.  Order Info =
692 692  
693 +== 8.1  Main Device LDDS04 ==
693 693  
694 -(% style="color:blue" %)**XXX**(%%)**: **The default frequency band
695 +Part Number **:** (% style="color:blue" %)**LDDS04-XX**
695 695  
697 +
698 +(% style="color:blue" %)**XX**(%%)**: **The default frequency band
699 +
696 696  * (% style="color:red" %)**AS923 **(%%)**:** LoRaWAN AS923 band
697 697  * (% style="color:red" %)**AU915 **(%%)**:** LoRaWAN AU915 band
698 698  * (% style="color:red" %)**EU433 **(%%)**:** LoRaWAN EU433 band
... ... @@ -702,13 +702,21 @@
702 702  * (% style="color:red" %)**IN865 **(%%)**:**  LoRaWAN IN865 band
703 703  * (% style="color:red" %)**CN470 **(%%)**:** LoRaWAN CN470 band
704 704  
709 +== 8.2  Probe Model ==
705 705  
706 -= 8. ​ Packing Info =
711 +Detail See [[Probe Option>>path:#Probe_Option]] Section
707 707  
713 +* A01A-15
714 +* A02-15
715 +* A13-15
716 +* A16-15
708 708  
718 += 9. ​ Packing Info =
719 +
720 +
709 709  **Package Includes**:
710 710  
711 -* LSN50v2-D2x LoRaWAN Temperature Sensor x 1
723 +* LDDS04 LoRaWAN 4-Channels Distance Sensor x 1
712 712  
713 713  **Dimension and weight**:
714 714  
... ... @@ -717,8 +717,7 @@
717 717  * Package Size / pcs : cm
718 718  * Weight / pcs : g
719 719  
732 += 10.  ​Support =
720 720  
721 -= 9.  ​Support =
722 -
723 723  * 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.
724 724  * 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]].
1655952600869-544.png
Author
... ... @@ -1,1 +1,0 @@
1 -XWiki.Xiaoling
Size
... ... @@ -1,1 +1,0 @@
1 -78.5 KB
Content
image-20220623113318-1.jpeg
Author
... ... @@ -1,1 +1,0 @@
1 -XWiki.Xiaoling
Size
... ... @@ -1,1 +1,0 @@
1 -86.7 KB
Content
image-20220623113318-2.png
Author
... ... @@ -1,1 +1,0 @@
1 -XWiki.Xiaoling
Size
... ... @@ -1,1 +1,0 @@
1 -352.6 KB
Content
image-20220623113318-3.png
Author
... ... @@ -1,1 +1,0 @@
1 -XWiki.Xiaoling
Size
... ... @@ -1,1 +1,0 @@
1 -377.8 KB
Content
image-20220623113915-4.png
Author
... ... @@ -1,1 +1,0 @@
1 -XWiki.Xiaoling
Size
... ... @@ -1,1 +1,0 @@
1 -296.8 KB
Content
image-20220623114454-1.png
Author
... ... @@ -1,1 +1,0 @@
1 -XWiki.Xiaoling
Size
... ... @@ -1,1 +1,0 @@
1 -295.3 KB
Content