moved mac storage out of espnow lib

client/client_mock/libs

+/home/moritz/Documents/TEAM/sensor-system/client/libs/
\ No newline at end of file

client/client_mock/src/main.cpp

@@ -16,14 +16,14 @@ void send_msgs(const std::__cxx11::list<Message> msgs) {
     for (const Message &msg: msgs) {
 
         if (msg.send() != ESP_OK) {
-            RtcMemory::store(msg.getMessageAsMinifiedJsonString());
+            RtcMemory::getInstance().store_data(msg.getMessageAsMinifiedJsonString());
         }
         unsigned long ts = millis();
         // it takes ~110ms for receiving an acknowledgement by the host in perfect conditions
         uint16_t message_timeout = 2000;
         while (!was_msg_received()) {
             if ((millis() - ts) > message_timeout) {
-                RtcMemory::store(msg.getMessageAsMinifiedJsonString());
+                RtcMemory::getInstance().store_data(msg.getMessageAsMinifiedJsonString());
                 ESP_LOGE(TAG, "Timeout: Host not available\n");
                 break;
             }

client/libs/caching/src/ram_caching.cpp

 #include "ram_caching.hpp"
 
-namespace RtcMemory{
-    // 2D array of 20 Strings with maxLength of 251
-    RTC_DATA_ATTR char storage[maxLength_][maxSize_];
-    RTC_DATA_ATTR int storedElements;
-    RTC_DATA_ATTR int headElement = 0;
-    RTC_DATA_ATTR int tailElement = 0;
+static const char* TAG = "CACHING";
+RTC_DATA_ATTR char storage[maxLength_][maxSize_];
+RTC_DATA_ATTR int storedElements;
+RTC_DATA_ATTR int headElement = 0;
+RTC_DATA_ATTR int tailElement = 0;
 
-    static const char* TAG = "CACHING";
+void RtcMemory::store_data(std::string message){
 
+    // turn data into char array
+    const char* jsonString = message.c_str();
 
-    void store(std::string message){
-
-        // turn data into char array
-        const char* jsonString = message.c_str();
-    
-        // move head to new element
-        headElement = (headElement + 1) % maxSize_;
-        // apparently I am not allowed to copy to rtc mem
-        for(int i=0; i<maxLength_; i++){
-            storage[i][headElement] = jsonString[i];
-            if(jsonString[i] == '\0'){
-                break;
-            }
+    // move head to new element
+    headElement = (headElement + 1) % maxSize_;
+    // apparently I am not allowed to copy to rtc mem
+    for(int i=0; i<maxLength_; i++){
+        storage[i][headElement] = jsonString[i];
+        if(jsonString[i] == '\0'){
+            break;
         }
-        storedElements++;
-        ESP_LOGE(TAG, "Moved message to storage.");
     }
+    storedElements++;
+    ESP_LOGE(TAG, "Moved message to storage.");
+}
 
-    String get_from_storage(){
-        // remove element pointed at by tail
-        String buf = "";
-        char current = '\0';
-        for(int i = 0; i<maxLength_; i++){
-            current = storage[i][tailElement];
-            buf += current;
-            if(current == '\0'){
-                break;
-            }
+String RtcMemory::get_data_from_storage(){
+    // remove element pointed at by tail
+    String buf = "";
+    char current = '\0';
+    for(int i = 0; i<maxLength_; i++){
+        current = storage[i][tailElement];
+        buf += current;
+        if(current == '\0'){
+            break;
         }
-        // move tail to next element
-        tailElement = (tailElement + 1) % maxSize_;
-        storedElements--;
-        ESP_LOGE(TAG, "Retrieved message from storage");
-        return buf;
     }
+    // move tail to next element
+    tailElement = (tailElement + 1) % maxSize_;
+    storedElements--;
+    ESP_LOGE(TAG, "Retrieved message from storage");
+    return buf;
+}
 
-    bool is_full(){
-        return headElement == tailElement;
-    }
+bool RtcMemory::is_data_storage_full(){
+    return headElement == tailElement;
+}
+
+int RtcMemory::amount_stored_data(){
+    return storedElements;
+}
+
+void RtcMemory::get_host_mac(uint8_t* destination, bool open){
+    
+    if(!open){preferences.begin("config", true);}
+
+	if (preferences.isKey("host")) {
+		preferences.getBytes("host", destination, sizeof(uint8_t) * 6);
+        ESP_LOGI(TAG, "Host Mac retrieved from flash");
+	} else {
+		memcpy(destination, BROADCAST_MAC, sizeof(BROADCAST_MAC));
+		ESP_LOGI(TAG, "Backup MAC address used");
+	}
+
+	if(!open){preferences.end();}
 
-    int stored_amount(){
-        return storedElements;
-    }
 }
+
+void RtcMemory::store_mac_address(uint8_t* mac){
+    preferences.begin("config", false);
+    if(preferences.putBytes("host", mac, sizeof(mac)) > 0){
+        ESP_LOGI(TAG, "Host MAC address saved to flash %02X:%02X:%02X:%02X:%02X:%02X", mac[0],
+        mac[1],mac[2],mac[3],mac[4],mac[5]);
+        }
+        else{
+            ESP_LOGI(TAG, "Couldn't save Host Mac to flash");
+        }
+    preferences.end();
+}
+
+bool RtcMemory::does_host_exist(){
+    preferences.begin("config", true);
+    bool answer = preferences.isKey("host");
+    preferences.end();
+    return answer;
+}
\ No newline at end of file

client/libs/caching/src/ram_caching.hpp

@@ -2,15 +2,38 @@
 #define _RAM_CACHE
 #include "esp_log.h"
 #include <ESP32Time.h>
+#include <Preferences.h>
 
 #define maxSize_ 20
 #define maxLength_ 251
 
-namespace RtcMemory {
-    void store(std::string message);
-    String get_from_storage();
-    bool is_full();
-    int stored_amount();
-}
+// move to singleton according to https://stackoverflow.com/a/1008289
+// used to save data/mac addresses without loosing them in deep sleep
+class RtcMemory {
+    public:
+        static RtcMemory &getInstance(){
+            static RtcMemory instance;
+            return instance;
+        }
+
+        RtcMemory(RtcMemory const&) = delete;
+        void operator=(RtcMemory const&) = delete;
+
+        void store_data(std::string message);
+        String get_data_from_storage();
+        bool is_data_storage_full();
+        int amount_stored_data();
+        void store_mac_address(uint8_t* mac);
+        void get_host_mac(uint8_t* destination, bool open=false);
+        bool does_host_exist();
+
+    private:
+        RtcMemory(){}
+        // used for data storage
+        // used for MAC storage
+        Preferences preferences;
+        uint8_t BROADCAST_MAC[6] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
+
+};
 
 #endif
\ No newline at end of file

client/libs/espnow/src/ESPNow.cpp

@@ -58,50 +58,35 @@ void on_data_recv(const uint8_t *mac, const uint8_t *incomingData, int len)
 		case hostChange:{
 			ESP_LOGI(TAG, "hostChange received");
 			Time::getInstance().setTime(received_msg.epoch_seconds);
+			
 			// delete old host
-			preferences.begin("config", false);
-			if(preferences.isKey("host")){
+			uint8_t old[6];
+			RtcMemory::getInstance().get_host_mac(old);
+			if(memcmp(received_msg.host, old, 6) == 0){
 				ESP_LOGI(TAG, "removing old host");
-				uint8_t old[6];
-				preferences.end();
-				get_host_mac(old); // maybe problem here, re-opening preferences
 				esp_now_del_peer(old);
 			}
 			// add new host
-			preferences.begin("config", false);
-			if(preferences.putBytes("host", received_msg.host, sizeof(received_msg.host)) > 0){
-				ESP_LOGI(TAG, "Host MAC address saved to flash %02X:%02X:%02X:%02X:%02X:%02X", received_msg.host[0],
-			received_msg.host[1],received_msg.host[2],received_msg.host[3],received_msg.host[4],received_msg.host[5]);
-			}
-			else{
-				ESP_LOGI(TAG, "Couldn't save Host Mac to flash");
-			}
-			preferences.end();
+			RtcMemory::getInstance().store_mac_address(received_msg.host);
 			add_host_to_peers(received_msg);
 		}
 		case dataAck:{
 			ESP_LOGI(TAG, "dataAck received.");
 			Time::getInstance().setTime(
 			received_msg.epoch_seconds); // see https://www.esp32.com/viewtopic.php?t=9965, maybe this needs an offset
-			
 			ESP_LOGI(TAG, "Timestamp received: %ld", Time::getInstance().getEpochSeconds());
-			preferences.begin("config", false);
-			if (!preferences.isKey("host")) {
-				if(preferences.putBytes("host", received_msg.host, sizeof(received_msg.host)) > 0){
-			ESP_LOGI(TAG, "host MAC address saved to flash %02X:%02X:%02X:%02X:%02X:%02X", received_msg.host[0],
-			received_msg.host[1],received_msg.host[2],received_msg.host[3],received_msg.host[4],received_msg.host[5]);
-				}
-
-			// add host to peers
-			add_host_to_peers(received_msg);
+			if(RtcMemory::getInstance().does_host_exist()){
+				RtcMemory::getInstance().store_mac_address(received_msg.host);
+				add_host_to_peers(received_msg);
 			}
-			preferences.end();
-			// delay(50);
-			msg_recv = true;
+			// add host to peers
 		}
+			// delay(50);
+		
 		default:{
 			break;
 		}
+		msg_recv = true;
 	}
 }
 

client/libs/espnow/src/ESPNow.hpp

@@ -10,6 +10,7 @@
 #include <Preferences.h>
 #include <WiFi.h>
 #include <esp_now.h>
+#include <algorithm>
 
 enum MessageType{
     dataAck,

[Moritz Perschke]

The SymLink enables me to edit the /lib files while also taking advantage of IntelliSense