Examples: rename existing, add example for local broker bridge

examples/espidf/bridge-espnow-local-broker/README.md

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+# SPSP bridge example
+
+Simple example of how to integrate SPSP framework into ESP-IDF and create
+*bridge* node.
+
+Uses ESP-NOW as *local layer* and [local broker](/#local-broker-far-layer) as *far layer*.

examples/espidf/bridge-espnow-local-broker/main/main.cpp

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+#include "spsp.hpp"
+
+extern "C" void app_main()
+{
+    /**
+     * Config
+     */
+
+    // ESPNOW config
+    SPSP::LocalLayers::ESPNOW::Config espnowConfig = {};
+    espnowConfig.ssid = 0x00000000;
+    espnowConfig.password = "12345678123456781234567812345678";
+
+
+    /**
+     * Init
+     */
+
+    // Initialize WiFi
+    static SPSP::WiFi::Station wifi{{}};
+
+    // Set WiFi channel
+    //
+    // As we use `LocalBroker` far layer, we don't need IP connectivity at all
+    // and thus WiFi will be used purely by ESP-NOW to receive and send data
+    // to clients.
+    // We can set any WiFi channel we want (allowed by local law) and clients
+    // will discover this bridge automatically.
+    //
+    // Remember, however, to use `wifi.setChannelRestrictions(...)` method on
+    // both bridge and client, if you intend to use channels 12 or 13.
+    wifi.setChannel(7);
+
+    // Create layers
+    static SPSP::LocalLayers::ESPNOW::Adapter llAdapter{};
+    static SPSP::LocalLayers::ESPNOW::ESPNOW ll{llAdapter, wifi, espnowConfig};
+    static SPSP::FarLayers::LocalBroker::LocalBroker fl{};
+
+    // Create bridge
+    static SPSP::Nodes::Bridge spsp{&ll, &fl};
+
+    /**
+     * Publish and subscribe
+     * API is the same as for the client.
+     * Typically, you publish and subscribe on clients only,
+     * but you can do the same on bridges too.
+     */
+
+    bool delivered = spsp.publish("topic", "payload");
+
+    if (delivered) {
+        // ...
+    } else {
+        // ...
+    }
+
+    delivered = spsp.subscribe(
+        "topic2",
+        [](const std::string& topic, const std::string& payload) {
+            // Do something when data on `topic2` are received
+            // ...
+        }
+    );
+
+    // We don't need this subscription anymore
+    delivered = spsp.unsubscribe("topic2");
+}

examples/espidf/bridge-espnow-mqtt/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.16)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+
+project(spsp_bridge_example)

examples/espidf/client-espnow/main/CMakeLists.txt

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+idf_component_register(SRCS "main.cpp"
+                       INCLUDE_DIRS ".")

examples/espidf/client-espnow/main/idf_component.yml

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+dependencies:
+  spsp:
+    git: https://github.com/DavidB137/spsp.git

examples/espidf/client-espnow/sdkconfig.defaults

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+CONFIG_COMPILER_OPTIMIZATION_SIZE=y
+CONFIG_COMPILER_CXX_EXCEPTIONS=y