add mock host that allows viewing of received espnow data

host/mock/.gitignore

+.pio
+CMakeListsPrivate.txt
+cmake-build-*/ 

host/mock/include/README

+
+This directory is intended for project header files.
+
+A header file is a file containing C declarations and macro definitions
+to be shared between several project source files. You request the use of a
+header file in your project source file (C, C++, etc) located in `src` folder
+by including it, with the C preprocessing directive `#include'.
+
+```src/main.c
+
+#include "header.h"
+
+int main (void)
+{
+ ...
+}
+```
+
+Including a header file produces the same results as copying the header file
+into each source file that needs it. Such copying would be time-consuming
+and error-prone. With a header file, the related declarations appear
+in only one place. If they need to be changed, they can be changed in one
+place, and programs that include the header file will automatically use the
+new version when next recompiled. The header file eliminates the labor of
+finding and changing all the copies as well as the risk that a failure to
+find one copy will result in inconsistencies within a program.
+
+In C, the usual convention is to give header files names that end with `.h'.
+It is most portable to use only letters, digits, dashes, and underscores in
+header file names, and at most one dot.
+
+Read more about using header files in official GCC documentation:
+
+* Include Syntax
+* Include Operation
+* Once-Only Headers
+* Computed Includes
+
+https://gcc.gnu.org/onlinedocs/cpp/Header-Files.html

host/mock/platformio.ini

+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[env:esp32-c3-devkitm-1]
+platform = espressif32
+board = esp32-c3-devkitm-1
+framework = arduino
+lib_deps =
+    bblanchon/ArduinoJson@^6.19.4
+    fbiego/ESP32Time@^2.0.0

host/mock/src/main.cpp

+#include "ESP32Time.h"
+#include <Arduino.h>
+#include <ArduinoJson.h>
+#include <WiFi.h>
+#include <esp_log.h>
+#include <esp_now.h>
+
+static const std::string TAG = "MAIN";
+static const std::string TAG_ESPNOW = "ESPNOW";
+static const std::string TAG_GSM = "GSM";
+
+ESP32Time rtc;
+TaskHandle_t ESPNOWTask;
+
+void on_data_sent(const uint8_t *mac_addr, esp_now_send_status_t status)
+{
+	// go to sleep
+}
+
+String getMacAddressAsString(const uint8_t *mac);
+DynamicJsonDocument parseReceivedJsonData(char *data);
+
+void on_data_recv(const uint8_t *mac, const uint8_t *incomingData, int len)
+{
+	esp_log_write(ESP_LOG_INFO, TAG_ESPNOW.c_str(), "Message recieved\n");
+	// copy received data to a char array
+	char data[len];
+	memcpy(data, incomingData, len);
+	esp_log_write(ESP_LOG_DEBUG, TAG_ESPNOW.c_str(), "Raw received Data: %s\n", data);
+
+	DynamicJsonDocument doc = parseReceivedJsonData(data);
+
+	String macAddress = getMacAddressAsString(mac);
+
+	// add timestamp and mac address
+	doc["timestamp"] = rtc.getEpoch();
+	doc["clientMac"] = macAddress;
+
+	// serialize json document again
+	std::string dataString{};
+	serializeJson(doc, dataString);
+}
+
+DynamicJsonDocument parseReceivedJsonData(char *data)
+{
+	DynamicJsonDocument doc(250);
+	auto error = deserializeJson(doc, data);
+	if (error) {
+		esp_log_write(ESP_LOG_ERROR, TAG_ESPNOW.c_str(), "Error while parsing json: %s\n", error.f_str());
+		// TODO error handling
+	}
+	return doc;
+}
+String getMacAddressAsString(const uint8_t *mac)
+{
+	String macAddress;
+	for (int i = 0; i < 6; i++) {
+		macAddress += String(mac[i], HEX);
+	}
+	esp_log_write(ESP_LOG_DEBUG, TAG_ESPNOW.c_str(), "MAC: %s\n", macAddress.c_str());
+	return macAddress;
+}
+
+[[noreturn]] void ESPNOWReceiveTask(void *parameter)
+{
+	esp_log_write(ESP_LOG_DEBUG, TAG_ESPNOW.c_str(), "ESPNOWReceiveTask started on core %d\n", xPortGetCoreID());
+
+	WiFi.mode(WIFI_STA);
+
+	esp_log_write(ESP_LOG_DEBUG, TAG_ESPNOW.c_str(), "Initialising ESPNow...\n");
+
+	if (esp_now_init() != ESP_OK) {
+		// initialization failed
+		esp_log_write(ESP_LOG_ERROR, TAG_ESPNOW.c_str(), "Initialising ESPNow FAILED\n");
+		exit(ESP_FAIL);
+	}
+
+	esp_log_write(ESP_LOG_DEBUG, TAG_ESPNOW.c_str(), "Initialising ESPNow SUCCESS\n");
+
+	esp_now_register_recv_cb(on_data_recv);
+
+	while (true) {
+	}
+}
+
+void setup()
+{
+	// Set console baud rate
+	Serial.begin(115200);
+	delay(10);
+
+	//	https://stackoverflow.com/questions/60442350/arduinos-esp-log-set-vprintf-does-not-work-on-esp32
+	esp_log_level_set("*", ESP_LOG_VERBOSE);
+	esp_log_write(ESP_LOG_DEBUG, TAG.c_str(), "%s", WiFi.macAddress().c_str());
+
+	delay(1000);
+
+	// create ESPNOWReceiveTask. TODO: Until the UTC time is not synced, this will not add the correct time. If we
+	// TODO: create the task after the time is synced, no messages will be received until synchronization is done
+	xTaskCreatePinnedToCore(ESPNOWReceiveTask,   /* Function to implement the task */
+	                        "ESPNOWReceiveTask", /* Name of the task */
+	                        10000,               /* Stack size in words */
+	                        nullptr,             /* Task input parameter */
+	                        0,                   /* Priority of the task */
+	                        &ESPNOWTask,         /* Task handle. */
+	                        0);                  /* Core where the task should run */
+
+	// Restart takes quite some time
+	// To skip it, call init() instead of restart()
+	esp_log_write(ESP_LOG_DEBUG, TAG_GSM.c_str(), "Initializing modem...\n");
+}
+
+void loop() {}

host/mock/test/README

+
+This directory is intended for PlatformIO Test Runner and project tests.
+
+Unit Testing is a software testing method by which individual units of
+source code, sets of one or more MCU program modules together with associated
+control data, usage procedures, and operating procedures, are tested to
+determine whether they are fit for use. Unit testing finds problems early
+in the development cycle.
+
+More information about PlatformIO Unit Testing:
+- https://docs.platformio.org/en/latest/advanced/unit-testing/index.html