Last modified by Kilight Cao on 2025/03/20 16:02
<
From version < 139.2 >
edited by Xiaoling
on 2022/07/28 15:06
To version < 139.6 >
edited by Xiaoling
on 2022/07/28 15:38
>
Change comment: There is no comment for this version

Summary

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Content
... ... @@ -419,8 +419,6 @@
419 419  * Australia 1 (% style="color:red" %)corresponding Gateway server address:** **(% style="color:black" %)au1.cloud.thethings.network
420 420  * Legacy V2 Console : (% style="color:red" %)TTN v2 shuts down in December 2021
421 421  
422 -
423 -
424 424  (% style="color:blue" %)**Step 4: Create a Gateway**
425 425  
426 426  [[image:1652422440891-514.png||height="360" width="747"]]
... ... @@ -508,7 +508,7 @@
508 508  [[image:1652422794767-871.png]]
509 509  
510 510  (((
511 -(% style="color:#4f81bd" %)**Step 1**: (% style="color:black" %)Create a Device definition in TTN v3 with the OTAA keys from the example LT-22222-L IO Controller device.
509 +(% style="color:blue" %)**Step 1**: (%%)Create a Device definition in TTN v3 with the OTAA keys from the example LT-22222-L IO Controller device.
512 512  )))
513 513  
514 514  (((
... ... @@ -527,8 +527,11 @@
527 527  
528 528  [[image:1652422840936-838.png]]
529 529  
528 +
530 530  (((
531 -(% style="color:red" %)Note: You may be able to change these codes in a device by using a configuration facility on the device e.g. the LT-22222 uses a serial port access and a series of AT commands.  Changing the codes may be necessary in the case where you have to use codes assigned by a LoRa WAN server.
530 +(% style="color:red" %)**Note: You may be able to change these codes in a device by using a configuration facility on the device e.g. the LT-22222 uses a serial port access and a series of AT commands.  Changing the codes may be necessary in the case where you have to use codes assigned by a LoRa WAN server.**
531 +
532 +
532 532  )))
533 533  
534 534  (((
... ... @@ -562,11 +562,13 @@
562 562  [[image:1657089833529-558.png]]
563 563  
564 564  
566 +
565 565  First, input the End device ID, AppEUI and DevEUI.
566 566  
567 567  [[image:1657089845985-297.png]]
568 568  
569 569  
572 +
570 570  Secondly, choose the corresponding frequency and LoRaWAN class capabilities.
571 571  
572 572  [[image:1657089868506-654.png]]
... ... @@ -579,11 +579,15 @@
579 579  )))
580 580  
581 581  (((
582 -(% style="color:#4f81bd" %)**Step 2**: (% style="color:black" %)Power on LT-22222-L device and it will automatically join the TTN network. After joining successfully, it will start to upload messages to the TTN v3. Select the Live data tab and you will see the data appearing in the panel.
585 +(% style="color:blue" %)**Step 2**: (%%)Power on LT-22222-L device and it will automatically join the TTN network. After joining successfully, it will start to upload messages to the TTN v3. Select the Live data tab and you will see the data appearing in the panel.
586 +
587 +
583 583  )))
584 584  
585 585  (((
586 -(% style="color:red" %)Note that it may take some time for the device data to appear in the TTN v3 display.
591 +(% style="color:red" %)**Note that it may take some time for the device data to appear in the TTN v3 display.**
592 +
593 +
587 587  )))
588 588  
589 589  [[image:1657089884131-489.png]]
... ... @@ -593,15 +593,19 @@
593 593  
594 594  == 5.1 Home ==
595 595  
603 +
596 596  Shows the system running status.
597 597  
606 +
598 598  [[image:1652423418568-752.png||height="329" width="724"]]
599 599  
600 600  
610 +
601 601  == 5.2 LoRa Settings ==
602 602  
603 603  === 5.2.1 LoRa ~-~-> LoRa ===
604 604  
615 +
605 605  (((
606 606  This page shows the LoRa Radio Settings. There are a set of default frequency band according to LoRaWAN protocol, and user can customized the band* as well.
607 607  )))
... ... @@ -610,20 +610,25 @@
610 610  Different DLOS8N hardware version can support different frequency range:
611 611  )))
612 612  
613 -* **868**: valid frequency: 863Mhz ~~ 870Mhz. for bands EU868, RU864, IN865 or KZ865.
614 -* **915**: valid frequency: 902Mhz ~~ 928Mhz. for bands US915, AU915, AS923 or KR920
624 +* (% style="color:red" %)**868**(%%): valid frequency: 863Mhz ~~ 870Mhz. for bands EU868, RU864, IN865 or KZ865.
625 +* (% style="color:red" %)**915**(%%): valid frequency: 902Mhz ~~ 928Mhz. for bands US915, AU915, AS923 or KR920
615 615  
616 616  (((
617 -After user choose the frequency plan, he can see the actually frequency in used by checking the page **LogRead ~-~-> LoRa Log**
628 +
629 +
630 +After user choose the frequency plan, he can see the actually frequency in used by checking the page (% style="color:#037691" %)**LogRead ~-~-> LoRa Log**
618 618  )))
619 619  
620 620  [[image:1657090007385-854.png]]
621 621  
622 -Note *: **[[See this instruction for how to customize frequency band>>doc:Main.How to customized LoRaWAN frequency band.WebHome]]**
623 623  
636 +(% style="color:red" %)**Note *: [[See this instruction for how to customize frequency band>>doc:Main.How to customized LoRaWAN frequency band.WebHome]]**
624 624  
638 +
639 +
625 625  === 5.2.2 LoRa ~-~-> ABP Decryption ===
626 626  
642 +
627 627  The DLOS8N can communicate with LoRaWAN ABP End Node without the need of LoRaWAN server. It can be used in some cases such as:
628 628  
629 629  * No internet connection.
... ... @@ -631,15 +631,19 @@
631 631  
632 632  (((
633 633  Detail of this feature: **[[Communication with ABP End Node>>doc:Main.Communicate with ABP End Node without LoRaWAN Network Server --- LG308.WebHome]]**
650 +
651 +
634 634  )))
635 635  
636 636  [[image:1657089993263-743.png]]
637 637  
638 638  
657 +
639 639  == 5.3 LoRaWAN Settings ==
640 640  
641 641  === 5.3.1 LoRaWAN ~-~-> LoRaWAN ===
642 642  
662 +
643 643  This page is for the connection set up to a general LoRaWAN Network server such as: [[TTN>>url:http://www.thethingsnetwork.org/]], [[ChirpStack>>url:https://www.chirpstack.io/]] etc
644 644  
645 645  [[image:1657089950542-323.png]]
... ... @@ -653,8 +653,10 @@
653 653  **See:** **[[Filter unwanted LoRaWAN packets>>doc:Main.Filter unwanted LoRaWAN packets.WebHome]]**
654 654  
655 655  
676 +
656 656  === 5.3.2 LoRaWAN ~-~-> Amazon AWS-IoT ===
657 657  
679 +
658 658  [[image:1657089933044-221.png]]
659 659  
660 660  
... ... @@ -661,11 +661,13 @@
661 661  (((
662 662  Please see this instruction to know more detail and demo for how to connect to **[[AWS-IoT LoRaWAN Core>>doc:Main.AWS IoT Core for LoRaWAN.WebHome]].**
663 663  
686 +
664 664  
665 665  )))
666 666  
667 667  === 5.3.3 LoRaWAN ~-~-> LORIOT ===
668 668  
692 +
669 669  (((
670 670  Settings to communicate to LORIOT LoRaWAN Network Server: [[https:~~/~~/www.loriot.io/>>url:https://www.loriot.io/]]
671 671  )))
... ... @@ -672,13 +672,17 @@
672 672  
673 673  (((
674 674  Instruction: **[[Notes for LORIOT>>doc:Main.Notes for LORIOT.WebHome]]**
699 +
700 +
675 675  )))
676 676  
677 677  [[image:1657089965935-695.png]]
678 678  
679 679  
706 +
680 680  == 5.4 MQTT Settings ==
681 681  
709 +
682 682  If end nodes works in ABP mode, user can configure DLOS8N to transfer the data to MQTT broker,
683 683  
684 684  Instruction: **[[MQTT Forward Instruction>>doc:Main.MQTT Forward Instruction.WebHome]]**
... ... @@ -691,17 +691,21 @@
691 691  
692 692  === 5.5.1 System ~-~-> System Overview ===
693 693  
722 +
694 694  Shows the system info:
695 695  
696 696  [[image:1657090055371-265.png]]
697 697  
698 698  
728 +
699 699  === 5.5.2 System ~-~-> General ( login settings) ===
700 700  
731 +
701 701  [[image:1657090070500-921.png]]
702 702  
734 +
703 703  (((
704 -**__System Password:__**
736 +(% style="color:#037691" %)**__System Password:__**
705 705  )))
706 706  
707 707  (((
... ... @@ -713,57 +713,68 @@
713 713  )))
714 714  
715 715  (((
716 -**__Timezone: __**Set device timezone.
748 +(% style="color:#037691" %)**__Timezone:  __**(%%)Set device timezone.
717 717  )))
718 718  
719 719  (((
720 -**__Port forwarding: __**Enable/Disable the HTTP and SSH access via WAN interface.
752 +(% style="color:#037691" %)**__Port forwarding:  __**(%%)Enable/Disable the HTTP and SSH access via WAN interface.
721 721  
754 +
722 722  
723 723  )))
724 724  
725 725  === 5.5.3 System ~-~-> Network ===
726 726  
760 +
727 727  [[image:1657090089790-368.png]]
728 728  
763 +
729 729  (((
730 -**__LAN Settings:  __**When the DLOS8N has the AP enable, LAN settings specify the network info for DLOS8N's own network.
765 +(% style="color:#037691" %)**__LAN Settings:   __**(%%)When the DLOS8N has the AP enable, LAN settings specify the network info for DLOS8N's own network.
731 731  )))
732 732  
733 733  (((
734 -__**WAN Settings: **__Setting for DLOS8N WAN port
769 +(% style="color:#037691" %)__**WAN Settings: **__(%%)Setting for DLOS8N WAN port
735 735  )))
736 736  
737 737  (((
738 -__**WiFi Settings:  **__Setting for DLOS8N WiFi IP when use it as WiFi Client
773 +(% style="color:#037691" %)__**WiFi Settings:  **__(%%)Setting for DLOS8N WiFi IP when use it as WiFi Client
739 739  
775 +
740 740  
741 741  )))
742 742  
743 743  === 5.5.4 System ~-~-> WiFi ===
744 744  
781 +
745 745  DLOS8N WiFi Settings.
746 746  
747 747  [[image:1657090107468-438.png]]
748 748  
749 749  
787 +
750 750  === 5.5.5 System ~-~-> Cellular ===
751 751  
790 +
752 752  While use the cellular as Backup WAN, device will use Cellular for internet connection while WAN port or WiFi is not valid and switch back to WAN port or WiFi after they recover.
753 753  
754 754  [[image:1657090204066-944.png]]
755 755  
756 756  
757 -(% style="color:red" %)Note *: For DLOS8N which doesn't have the cellular module, this page will shows Cellular not detected.
796 +(% style="color:red" %)**Note *: For DLOS8N which doesn't have the cellular module, this page will shows Cellular not detected.**
758 758  
759 759  
799 +
760 760  === 5.5.6 System ~-~-> Network Status ===
761 761  
802 +
762 762  [[image:1657090227373-729.png]]
763 763  
764 764  
806 +
765 765  === 5.5.7 System ~-~-> Remote Mgnt & Auto Provision ===
766 766  
809 +
767 767  Auto Provision is the feature for batch configure and remote management. It can be used in below two cases:
768 768  
769 769  [[image:1652429518191-846.png||height="332" width="733"]]
... ... @@ -772,6 +772,7 @@
772 772  
773 773  [[image:1652429537849-154.png||height="339" width="722"]]
774 774  
818 +
775 775  Please see this document for detail:
776 776  
777 777  (((
... ... @@ -784,8 +784,10 @@
784 784  [[image:1657090254561-321.png]]
785 785  
786 786  
831 +
787 787  === 5.5.8 System ~-~-> Firmware Upgrade ===
788 788  
834 +
789 789  We keep improving the DLOS8N Linux side firmware for new features and bug fixes. Below are the links for reference.
790 790  
791 791  * **Latest firmware**: [[LoRa Gateway Firmware>>url:http://www.dragino.com/downloads/index.php?dir=LoRa_Gateway/LG02-OLG02/Firmware/]],
... ... @@ -808,10 +808,10 @@
808 808  
809 809  [[image:1657090275952-901.png]]
810 810  
811 -Select the required image and click **Flash Image.** The image will be uploaded to the device, and then click **Process Update** to upgrade.
857 +Select the required image and click (% style="color:blue" %)**Flash Image.**(%%) The image will be uploaded to the device, and then click (% style="color:blue" %)**Process Update**(%%) to upgrade.
812 812  
813 813  
814 -(% style="color:red" %)**NOTE**: (% style="color:black" %)You normally need to **//uncheck//** the **Preserve Settings** checkbox when doing an upgrade to ensure that there is no conflict between the old settings and the new firmware. The new firmware will start up with its default settings.
860 +(% style="color:red" %)**NOTE**(%%): You normally need to (% style="color:blue" %)**//uncheck//** (%%)the (% style="color:blue" %)**Preserve Settings**(%%) checkbox when doing an upgrade to ensure that there is no conflict between the old settings and the new firmware. The new firmware will start up with its default settings.
815 815  
816 816  The system will automatically boot into the new firmware after upgrade.
817 817  
... ... @@ -827,16 +827,21 @@
827 827  (% style="color:red" %)**NOTE**(%%) : it is important to transfer the image in the /var directory, otherwise it may exceed the available flash size.
828 828  
829 829  
876 +
830 830  === 5.5.9 System ~-~-> Reboot/Reset ===
831 831  
879 +
832 832  [[image:1657090333476-926.png]]
833 833  
834 834  (((
835 835  
884 +
885 +
836 836  )))
837 837  
838 838  === 5.5.10 System ~-~-> Package Maintain ===
839 839  
890 +
840 840  [[image:1657090378640-879.png]]
841 841  
842 842  [[image:1657090349947-814.png]]
... ... @@ -844,6 +844,7 @@
844 844  Place to show what package has installed and possible to upgrade packages.
845 845  
846 846  
898 +
847 847  == 5.6 LogRead ==
848 848  
849 849  === 5.6.1 LogRead ~-~-> LoRa Log ===
... ... @@ -857,25 +857,32 @@
857 857  
858 858  === 5.6.2 LogRead ~-~-> System Log ===
859 859  
912 +
860 860  Show the system log
861 861  
862 862  [[image:1657090485508-496.png]]
863 863  
864 864  
918 +
865 865  = 6. More features =
866 866  
867 867  == 6.1 More instructions ==
868 868  
923 +
869 869  [[LoRaWAN Gateway Instruction>>doc:Main.WebHome]](LoRaWAN Gateway)
870 870  
871 871  
927 +
872 872  = 7. Linux System =
873 873  
930 +
874 874  The DLOS8N is based on the OpenWrt Linux system. It is open source, and users are free to configure and modify the Linux settings.
875 875  
876 876  
934 +
877 877  == 7.1 SSH Access for Linux console ==
878 878  
937 +
879 879  User can access the Linux console via the SSH protocol. Make sure your PC and the DLOS8N are connected to the same network, then use a SSH tool (such as [[putty>>url:http://www.chiark.greenend.org.uk/~~sgtatham/putty/download.html]] in Windows) to access it.
880 880  
881 881  IP address:  IP address of DLOS8N
... ... @@ -892,11 +892,14 @@
892 892  
893 893  The “(% class="mark" %)**logread -f**(%%)” command can be used to debug how system runs.
894 894  
954 +
895 895  [[image:1657090508015-884.png]]
896 896  
897 897  
958 +
898 898  == 7.2 Edit and Transfer files ==
899 899  
961 +
900 900  (((
901 901  The DLOS8N supports the (% style="color:green" %)**SCP protocol** (% style="color:black" %)and has a built-in (% style="color:green" %)**SFTP server**. (% style="color:black" %)There are many ways to edit and transfer files using these protocols.
902 902  )))
... ... @@ -907,6 +907,8 @@
907 907  
908 908  (((
909 909  After establishing access via WinSCP to the device, you can use an FTP style window to drag / drop files to the DLOS8N, or edit the files directly in the windows.
972 +
973 +
910 910  )))
911 911  
912 912  (((
... ... @@ -916,8 +916,10 @@
916 916  [[image:1652431650755-450.png]]
917 917  
918 918  
983 +
919 919  == 7.3 File System ==
920 920  
986 +
921 921  (((
922 922  The DLOS8N has a 16MB flash and a 64MB RAM. The /var and /tmp directories are in the RAM, so contents stored in /tmp and /var will be erased after rebooting the device. Other directories are in the flash and will remain after reboot.
923 923  )))
... ... @@ -931,8 +931,10 @@
931 931  )))
932 932  
933 933  
1000 +
934 934  == 7.4 Package maintenance system ==
935 935  
1003 +
936 936  DLOS8N uses the OpenWrt [[**OPKG package maintenance system**>>https://oldwiki.archive.openwrt.org/doc/techref/opkg]]. There are more than 3000+ packages available in our package server for users to install for their applications. For example, if you want to add the **//iperf //** tool, you can install the related packages and configure DLOS8N to use **//iperf //**.
937 937  
938 938  (((
... ... @@ -985,6 +985,7 @@
985 985  (((
986 986  (% style="background-color:#dcdcdc" %)//Configuring iperf.//
987 987  
1056 +
988 988  
989 989  )))
990 990  
... ... @@ -991,10 +991,12 @@
991 991  = 8. Upgrade Linux Firmware =
992 992  
993 993  
1063 +
994 994  = 9. FAQ =
995 995  
996 996  == 9.1 How can I configure for a customized frequency band? ==
997 997  
1068 +
998 998  (((
999 999  See below link for how to customize frequency band: **[[How to customized LoRaWAN frequency band>>doc:Main.How to customized LoRaWAN frequency band.WebHome]]**
1000 1000  )))
... ... @@ -1001,15 +1001,20 @@
1001 1001  
1002 1002  (((
1003 1003  
1075 +
1076 +
1004 1004  )))
1005 1005  
1006 1006  == 9.2 Can I connect DLOS8N to LORIOT? ==
1007 1007  
1081 +
1008 1008  Yes, the set up instruction is here: **[[Notes for LORIOT>>doc:Main.Notes for LORIOT.WebHome]]**
1009 1009  
1010 1010  
1085 +
1011 1011  == 9.3 Can I make my own firmware for the gateway, where can I find the source code? ==
1012 1012  
1088 +
1013 1013  (((
1014 1014  Yes, You can make your own firmware for the DLOS8N for branding purposes or to add customized applications.
1015 1015  )))
... ... @@ -1019,15 +1019,19 @@
1019 1019  )))
1020 1020  
1021 1021  
1098 +
1022 1022  == 9.4 Can I use 868Mhz version for 915Mhz bands? ==
1023 1023  
1101 +
1024 1024  It is possible but the distance will be very short, you can select US915 frequency band in 868Mhz version hardware. It will work but you will see the performance is greatly decreased because the 868Mhz version has an RF filter for band 863~~870Mhz, all other frequencies will have high attenuation.
1025 1025  
1026 1026  
1105 +
1027 1027  = 10. Trouble Shooting =
1028 1028  
1029 1029  == 10.1 I get kernel error when install new package, how to fix? ==
1030 1030  
1110 +
1031 1031  In some cases, when installing a package with **//opkg//**, it will generate a kernel error such as below due to a mismatch I the kernel ID:
1032 1032  
1033 1033  (% style="background-color:yellow" %)root@dragino-16c538:~~# opkg install kmod-dragino2-si3217x_3.10.49+0.2-1_ar71xx.ipk
... ... @@ -1049,8 +1049,10 @@
1049 1049  (% style="background-color:yellow" %)Opkg install kmod-dragino2-si3217x_3.10.49+0.2-1_ar71xx.ipk –force-depends
1050 1050  
1051 1051  
1132 +
1052 1052  == 10.2 How to recover the DLOS8N if the firmware crashes ==
1053 1053  
1135 +
1054 1054  (((
1055 1055  Please follow this instruction to recover your gateway:  **[[Recover Gateway>>doc:Main.How to Recover Gateway if can't access it.WebHome]]**
1056 1056  )))
... ... @@ -1057,21 +1057,27 @@
1057 1057  
1058 1058  (((
1059 1059  
1142 +
1143 +
1060 1060  )))
1061 1061  
1062 1062  == 10.3 I configured DLOS8N for WiFi access and lost its IP. What to do now? ==
1063 1063  
1148 +
1064 1064  [[image:1657090540821-317.png]]
1065 1065  
1151 +
1066 1066  (((
1067 1067  The DLOS8N has a fall-back IP address on its WAN port. This IP is always enabled so you can use the fall-back IP to access DLOS8N no matter what the WiFi IP is. The fall back IP is useful for connecting and debug the unit.
1154 +
1155 +
1068 1068  )))
1069 1069  
1070 -(% style="color:red" %)Note: fallback IP can be disabled in the WAN and DHCP page.
1158 +(% style="color:red" %)**Note: fallback IP can be disabled in the WAN and DHCP page.**
1071 1071  
1072 1072  
1073 1073  (((
1074 -Steps to connect via fall back IP:
1162 +(% style="color:blue" %)**Steps to connect via fall back IP:**
1075 1075  )))
1076 1076  
1077 1077  (((
... ... @@ -1083,27 +1083,35 @@
1083 1083  )))
1084 1084  
1085 1085  (((
1174 +
1175 +
1086 1086  As below photo:
1087 1087  )))
1088 1088  
1089 1089  [[image:1652435256286-879.png]]
1090 1090  
1181 +
1091 1091  3. In the PC, use IP address 172.31.255.254 to access the DLOS8N via Web or Console.
1092 1092  
1184 +
1093 1093  Please note the latest firmware uses port 8000 for http and 2222 for ssh access.
1094 1094  
1095 1095  
1188 +
1096 1096  = 11. Order Info =
1097 1097  
1098 -(% style="color:#4f81bd" %) **//PART: DLOS8N-XXX-YYY//: **
1099 1099  
1100 -(% style="color:#4f81bd" %) **//XXX: Frequency Band//**
1192 + **//PART: (% style="color:blue" %)DLOS8N-XXX-YYY//(%%)**
1101 1101  
1102 -* (% style="color:red" %)** 868**(% style="color:black" %) : valid frequency: 863Mhz ~~ 870Mhz. for bands EU868, RU864, IN865 or KZ865.
1103 -* (% style="color:red" %)** 915**(% style="color:black" %):  valid frequency: 902Mhz ~~ 928Mhz. for bands US915, AU915, AS923 or KR920
1194 +**//XXX: Frequency Band//**
1104 1104  
1105 -(% style="color:#4f81bd" %) **//YYY: 4G Cellular Option//**
1196 +* (% style="color:red" %)** 868**(%%) : valid frequency: 863Mhz ~~ 870Mhz. for bands EU868, RU864, IN865 or KZ865.
1197 +* (% style="color:red" %)** 915**(%%):  valid frequency: 902Mhz ~~ 928Mhz. for bands US915, AU915, AS923 or KR920
1106 1106  
1199 +
1200 +
1201 +**//YYY: 4G Cellular Option//**
1202 +
1107 1107  * (% style="color:red" %)** E**(% style="color:black" %):  EMEA, Korea, Thailand, India.
1108 1108  * (% style="color:red" %)** A**(% style="color:black" %):  North America/ Rogers/AT&T/T-Mobile.
1109 1109  * (% style="color:red" %)** AU**(% style="color:black" %): Latin America, New Zeland, Taiwan
... ... @@ -1115,6 +1115,7 @@
1115 1115  
1116 1116  = 12. Packing Info =
1117 1117  
1214 +
1118 1118  (((
1119 1119  **Package Includes**:
1120 1120  )))
... ... @@ -1123,6 +1123,8 @@
1123 1123  * Stick Antenna for LoRa RF part. Frequency is one of 470 or 868 or 915Mhz depends the model ordered
1124 1124  * Packaging with environmental protection paper box
1125 1125  
1223 +
1224 +
1126 1126  (((
1127 1127  **Dimension and weight**:
1128 1128  )))
... ... @@ -1132,8 +1132,13 @@
1132 1132  * Package Size: 49 x 19.5 x x 19Package Size: 4912 cm
1133 1133  * Weight: 2.5kg
1134 1134  
1234 +
1235 +
1236 +
1237 +
1135 1135  = 13. Support =
1136 1136  
1240 +
1137 1137  * Try to see if your questions already answered in the [[wiki>>doc:Main.WebHome]].
1138 1138  * Support is provided Monday to Friday, from 09:00 to 18:00 GMT+8.
1139 1139  Due to different timezones we cannot offer live support. However, your questions will be answered as soon as possible in the before mentioned schedule.

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