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20	20	* Just storing the data on the gateway or external storage
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23	23	**The basic of this feature is the decoding of** (% style="color:blue" %)**LoRaWAN ABP End Node**(%%). **Requirements:**
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25	25	1. LoRaWAN End Node in ABP mode. Make sure your end node works in this mode. End node most are default set to OTAA mode
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36	36	Once the gateway is DHCP an IPV4 address, and then you can access the build-in server TTN-Stack.
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39	39	== 2.1.  Configure the gateway mode ==
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42	42	You can access  the gateway's Manage Web UI, via the URL ( (% style="color:blue" %)__**//http:~/~/<hostname> or http:~/~/<local-IPV4-address> //**__(%%)) in your browser
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45	45	=== (% style="color:#037691" %)**Selecting the right frequency band**(%%) ===
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48	48	[[image:image-20220802142103-1.png]]
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51	51	=== (% style="color:#037691" %)**Configure the Semtech UDP forwarder**(%%) ===
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54	54	[[image:image-20220802142147-3.png]]
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57	57	== 2.2.  Login to the built-in server TTN-Stack ==
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72	72	[[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20All%20Gateway%20models/HP0C/WebHome/image-20220725171719-1.png?width=769&height=570&rev=1.1||alt="image-20220725171719-1.png"]]
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75	75	== 2.3.  Add the gateway & the sensor ==
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78	78	Here only show the image of the finish, more details about how to add the gateway & sensor refer to this wiki:
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81	81	=== (% style="color:#037691" %)**Add the gateway**(%%) ===
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84	84	[[image:image-20220802142946-5.png]]
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87	87	=== (% style="color:#037691" %)**Add the Sensor**(%%) ===
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90	90	[[image:image-20220802143031-6.png||height="794" width="1375"]]
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93	93	== 2.4.  Add the decoder ==
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99	99	[[image:image-20220802143129-7.png]]
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102	102	== 2.5.  Visual Data ==
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110	110	[[image:image-20220802143214-8.png]]
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113	113	= 3.  Forward the data or store the data =
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116	116	You are done most of the work, now you just need to plan the flow of data to where.
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119	119	== 3.1  Forward data to an external server based on MQTT/HTTP. ==
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122		-=== (% style="color:blue" %)**MQTT**(%%) ===
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	135	+=== (% style="color:#037691" %)**MQTT**(%%) ===
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125		-You need to connect to this public address on your external server and subscribe to the topic (% style="color:#037691" %)**(v3/<application_name>/devices/<devices_name>/up)**.
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	138	+You need to connect to this public address on your external server and subscribe to the topic **(v3/<application_name>/devices/<devices_name>/up)**.
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128	128	[[image:image-20220802144754-9.png]]
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131		-(% style="color:#037691" %)**subscribe to the topic and get the data**
	144	+**subscribe to the topic and get the data**
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133	133	[[image:image-20220802145408-10.png]]
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137		-=== (% style="color:blue" %)**HTTP**(%%) ===
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	151	+=== (% style="color:#037691" %)**HTTP**(%%) ===
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140	140	[[image:image-20220802145450-11.png||height="676" width="1164"]]
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143	143	== 3.2  Forward data to the built-in application server Node-Red. ==
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146	146	[[image:image-20220802150715-1.png||height="739" width="1171"]]
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149	149	== 3.3  Just storing the data on the gateway or external storage. ==
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152	152	Data can be stored or read by subscribing to topics: (% style="color:#037691" %)**v3/<application_name>/devices/<devices_name>/up**.
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154		-Then add the storage node (% style="color:#037691" %)**(write file)**(%%), Users can download the Node-Red flowchart from this link to test data storage：[[attach:test_data_storage.json||target="_blank"]]
	170	+Then add the storage node **(write file)**, Users can download the Node-Red flowchart from this link to test data storage：[[attach:test_data_storage.json||target="_blank"]]
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156	156	After the configuration is complete, users can find the node logs in the root/ directory
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162	162	[[image:image-20220806153112-9.png||height="575" width="1167"]]
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165	165	[[image:image-20220806153048-8.png||height="608" width="1165"]]
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168	168	[[image:image-20220806153150-10.png]]
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171	171	= 4.  Sent the downlink to the sensor =
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174	174	Downlinks can be scheduled by publishing the message to the topic (% style="color:#037691" %)** v3/<application_name>/devices/<devices_name>/down/push**.
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177	177	(% style="color:red" %)**Note**: **Remember that the format of this topic for The Things Stack Open Source deployment would be (v3/<application_name>/devices/<devices_name>/down/push).**
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180	180	[[MQTT Server ~| The Things Stack for LoRaWAN (thethingsindustries.com)>>url:https://www.thethingsindustries.com/docs/integrations/mqtt/]]
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183		-Instead of /push, you can also use /replace to replace the downlink queue. Replacing with an empty array clears the downlink queue.
	200	+Instead of /push, you can also use /replace to replace the downlink queue. Replacing with an empty array clears the downlink queue. Example:
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185		-Example:
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187	187	(% class="box" %)
188	188	(((
189	189	{
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202	202	[[image:image-20220802164844-3.png||height="345" width="1131"]]
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205		-(% style="color:blue" %)**Node-red**
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	221	+**Node-red**
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207	207	Users can download the Node-Red flowchart for testing [[attach:mqtt-test.json||target="_blank"]]
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210	210	[[image:image-20220802172021-6.png||height="455" width="1240"]]
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213	213	= 5.  Trouble Shootings =
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