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Ref #7867. Added Zephyr simulator (#128)
* Added Zephyr emulator section * Copy content * Update tutorial * Added image * Fix link * FIx link * Update agent install * Update folder tree * Update tree * Minor fixes * Update * Update * Update * Minor fixes Co-Authored-By: Julián Bermúdez Ortega <julianbermudez@eprosima.com> Update _docs/tutorials/advanced/zephyr/zephyr_emulator/index.md Co-Authored-By: Julián Bermúdez Ortega <julianbermudez@eprosima.com> Update _docs/tutorials/advanced/zephyr/zephyr_emulator/index.md Co-Authored-By: Julián Bermúdez Ortega <julianbermudez@eprosima.com> Update _docs/tutorials/advanced/zephyr/zephyr_emulator/index.md Co-Authored-By: Julián Bermúdez Ortega <julianbermudez@eprosima.com> Update _docs/tutorials/advanced/zephyr/zephyr_emulator/index.md Co-Authored-By: Julián Bermúdez Ortega <julianbermudez@eprosima.com> Update _docs/tutorials/advanced/zephyr/zephyr_emulator/index.md Co-Authored-By: Julián Bermúdez Ortega <julianbermudez@eprosima.com> Update _docs/tutorials/advanced/zephyr/zephyr_emulator/index.md Co-Authored-By: Julián Bermúdez Ortega <julianbermudez@eprosima.com> Update _docs/tutorials/advanced/zephyr/zephyr_emulator/index.md Co-Authored-By: Julián Bermúdez Ortega <julianbermudez@eprosima.com> Update _docs/tutorials/advanced/zephyr/zephyr_emulator/index.md Co-Authored-By: Julián Bermúdez Ortega <julianbermudez@eprosima.com> Update _docs/tutorials/advanced/zephyr/zephyr_emulator/index.md Co-Authored-By: Julián Bermúdez Ortega <julianbermudez@eprosima.com> Update pushd popd * Update sudos
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‎_data/docs.yml‎

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- title: Advanced Tutorials with Zephyr
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docs:
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- tutorials/advanced/zephyr/zephyr_getting_started
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- tutorials/advanced/zephyr/zephyr_emulator
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- title: Advanced Tutorials with Linux

‎_docs/concepts/rtos/comparison/index.md‎

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‎_docs/tutorials/advanced/freertos/freertos_getting_started/index.md‎

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```bash
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# Creating a new app
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cd firmware/freertos_apps/apps
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pushd firmware/freertos_apps/apps
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mkdir my_brand_new_app
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cd my_brand_new_app
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touch app.c app-colcon.meta
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popd
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```
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For this example we are going to create a ping pong app where a node sends a ping package with a unique identifier using a publisher and the same package is received by a pong subscriber. The node will also answer to:
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rcl_publisher_t pong_publisher = rcl_get_zero_initialized_publisher();
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rcl_publisher_init(&pong_publisher, &node, ROSIDL_GET_MSG_TYPE_SUPPORT(std_msgs, msg, Header), "/microROS/pong", &pong_publisher_ops);
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// Create a reliable pong subscriber
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// Create a best effort pong subscriber
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rcl_subscription_options_t pong_subscription_ops = rcl_subscription_get_default_options();
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pong_subscription_ops.qos.reliability = RMW_QOS_POLICY_RELIABILITY_BEST_EFFORT;
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rcl_subscription_t pong_subscription = rcl_get_zero_initialized_subscription();
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rcl_subscription_init(&pong_subscription, &node, ROSIDL_GET_MSG_TYPE_SUPPORT(std_msgs, msg, Header), "/microROS/pong", &pong_subscription_ops);
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ros2 run micro_ros_setup create_agent_ws.sh
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# Build micro-ROS-Agent packages, this may take a while.
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colcon build
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colcon build --metas src
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source install/local_setup.bash
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```
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Then connect the Olimex development board to the computer using the usb to serial cable:

‎_docs/tutorials/advanced/zephyr/zephyr_emulator/imgs/4.jpg‎

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