Create how to share sensor data via http_request (#2893)

* Create how to share sensor data via http_request

initial webserver for http_request

* Update how to share sensor data via http_request

* Rename how to share sensor data via http_request to http_request_sensor.rst

* Update http_request_sensor.rst

* added client and server images

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fixed template sensor

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fixed template senor indent

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* Update index.rst

added htttp_request to cookbook

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updated node ----> nodes

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Updated node to nodes in index.rst

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fixed headline underline too short

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---------

Co-authored-by: H. Árkosi Róbert <robreg@zsurob.hu>

cookbook/http_request_sensor.rst

@@ -0,0 +1,82 @@
+Share data directly between ESPHome nodes
+=========================================
+You need two ESPHome nodes. One will be the server, and the others will be the clients (can be multiple). You must set up a webserver on your primary esphome to make available the required sensor data using the  :doc:`/components/web_server`.
+
+Server part
+-----------
+
+.. code-block:: yaml
+
+    # Webserver configration
+    web_server:
+      port: 80
+  
+Client part
+-----------
+
+On the client nodes we need a :doc:`/components/http_request` with an ``http_request_data`` id set, and a :doc:`/components/sensor/template` to make it accessible locally.
+
+.. code-block:: yaml
+
+    http_request:
+      useragent: esphome/device
+      timeout: 10s
+      id: http_request_data
+
+    sensor:
+      - platform: template
+        name: "Name of the template sensor"
+        id: id_of_the_template_sensor
+
+
+Pulling the data
+****************
+
+To automate the request for data, we will add an interval component requesting the URL pointing to the sensor id for which the state is needed. See :ref:`api-rest` on how to build up the URL for your sensors.
+
+.. note::
+
+    The domain is the type of the component, for example ``sensor`` or ``light``. ``id`` refers to the ID of the component - which is created from the name of the component, stripping out all non-alphanumeric characters, making everything lowercase and replacing all spaces by underscores. To confirm the corrrct ID to use, you can set the log level to VERY_VERBOSE on your server node and look for ``object_id:`` in the logs.
+
+In the example below we pull the value of a sensor, and after parsing the resulted JSON string we publish it to the template sensor:
+
+.. code-block:: yaml
+
+    interval:
+  - interval: 60s
+    then:
+      - http_request.get: 
+          url: http://address.of.server.node/sensor/ID.of.the.sensor
+          on_response:
+            then:
+              - lambda: |-
+                  json::parse_json(id(http_request_data).get_string(), [](JsonObject root) {
+                      id(id_of_the_template_sensor).publish_state(root["value"]);
+                  });
+
+                 
+Result
+------
+
+.. figure:: images/server.png
+    :align: center
+    :width: 90.0%
+
+Server side real sensor.
+
+
+.. figure:: images/clients.png
+    :align: center
+    :width: 90.0%
+
+Client side template sensor.
+
+
+See Also
+--------
+
+- :doc:`/components/web_server`
+- :doc:`/components/http_request`
+- :ref:`api-rest`
+- :doc:`/components/sensor/template`
+- :ghedit:`Edit`

index.rst

@@ -838,6 +838,7 @@ Cookbook
     Sonoff Fishpond Pump, cookbook/sonoff-fishpond-pump, cookbook-sonoff-fishpond-pump.jpg
     Arduino Port Extender, cookbook/arduino_port_extender, arduino_logo.svg
     EHMTX a matrix status/text display, cookbook/ehmtx, ehmtx.jpg
+    Share data directly between ESPHome nodes, cookbook/http_request_sensor, connection.svg
     Automatic Updates with Home Assistant, cookbook/homeassistant_upgrade, home-assistant.svg
 
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