fix message sending, add simple esp32 host

client/client/include/MeasurementData.hpp

@@ -34,7 +34,6 @@ class MeasurementData {
 	double value;
 	std::string measurementType; // TODO: consider using an enum
 	std::optional<int> channel;
-
 	std::optional<int> i2cAddress;
 };
 #endif // CLIENT_MEASUREMENTDATA_HPP

client/client/lib/espnow/src/ClientDataPackage.hpp

@@ -50,4 +50,5 @@ class ClientDataPackage {
 		serializeJson(document, jsonString);
 		return jsonString;
 	}
+
 };

client/client/lib/espnow/src/ESPNow.cpp

 #include "ESPNow.hpp"
 
-static const char* TAG = "ESPNOW";
+static const char *TAG = "ESPNOW";
 
 uint8_t BROADCAST_MAC[] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
 esp_now_peer_info_t hostInfo;
@@ -53,7 +53,10 @@ esp_err_t espnow_setup()
 	get_host_mac(hostInfo.peer_addr); // check if there is a host saved in flash mem, broadcast otherwise
 
 	hostInfo.channel = 0;
-	hostInfo.encrypt = 0;
+
+	// TODO: PMK is used to encrypt LMK with the AES-128 algorithm. Call esp_now_set_pmk() to set PMK. If PMK is not set, a
+	// default PMK will be used. https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/network/esp_now.html
+	hostInfo.encrypt = false;
 	esp_now_add_peer(&hostInfo);
 
 	esp_now_register_recv_cb(on_data_recv);

client/client/lib/espnow/src/Message.cpp

@@ -9,8 +9,11 @@ esp_err_t Message::send() const
 	ESP_LOGI(TAG, "Sending message");
 	esp_err_t success;
 	auto messageData = getMessageAsMinifiedJsonString();
-	success = esp_now_send(recipient, (uint8_t *)&messageData, sizeof(clientDataPackage));
+
+	// conversion from std::string to c_str adds null terminator, which is why we add 1 to message length
+	success = esp_now_send(recipient, (uint8_t *)messageData.c_str(), (messageData.length() + 1) * sizeof(char));
 	if (success != ESP_OK) {
+		ESP_LOGE(TAG, "Error sending the data");
 		// TODO REWRITE FOR JSON
 		//		if (!ram_cache_is_full()) {
 		//			//			ram_cache_push(messageData);

client/client/platformio.ini

@@ -20,6 +20,9 @@ build_flags =
 	-DCORE_DEBUG_LEVEL=5
 	-std=gnu++17
 build_unflags = -std=gnu++11
+; serial port
+monitor_port = /dev/ttyUSB1
+upload_port = /dev/ttyUSB1
 lib_deps =
 	sparkfun/SparkFun SCD30 Arduino Library@^1.0.18
 	Wire

client/client/src/main.cpp

@@ -14,6 +14,8 @@ void setup()
 {
 	Serial.begin(115200);
 	drs26.setup();
+	espnow_setup();
+
 	//	log_e("Setup complete.");
 }
 
@@ -23,7 +25,6 @@ void loop()
 	out_data_drs26 data{};
 
 	try {
-		espnow_setup();
 		//			data = drs26.readData();
 		auto messages = drs26.buildMessages();
 

host/esp32/src/main.cpp

+#include <Arduino.h>
+#include <WiFi.h>
+#include <esp_now.h>
+
+void on_data_sent(const uint8_t *mac_addr, esp_now_send_status_t status)
+{
+	// go to sleep
+}
+
+void on_data_recv(const uint8_t *mac, const uint8_t *incomingData, int len)
+{
+	// print mac
+	Serial.println("Message recieved");
+	for (int i = 0; i < 6; i++) {
+		Serial.print(mac[i], HEX);
+		Serial.print(":");
+	}
+	Serial.println();
+
+	char data[len];
+	memcpy(data, incomingData, len);
+	Serial.println(data);
+}
+
+void setup()
+{
+	Serial.begin(115200);
+	WiFi.mode(WIFI_STA);
+	Serial.println("ESPNow init");
+	if (esp_now_init() != ESP_OK) {
+		// initialization failed
+		Serial.println("ESPNow init failed");
+		return; // not sure about this
+	}
+	Serial.println("ESPNow init success");
+
+	esp_now_register_recv_cb(on_data_recv);
+	//  write your initialization code here
+}
+
+void loop() {
+}
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