finally fix wifi name to be unique

fan_control/include/ota.hpp

@@ -4,4 +4,4 @@
 #include <ESP8266mDNS.h>
 #include <ArduinoOTA.h>
 
-void ota_setup(const char* name);
+void ota_setup();

fan_control/src/main.cpp

@@ -6,11 +6,10 @@
 #include "serial.hpp"
 
 
-const char* ssid = "fan_XXX";
 
 void setup() {
   Serial.begin(115200);
-  ota_setup(ssid);
+  ota_setup();
   server_setup();
   collector_setup();
   DEBUG_OUT.println(F("Setup done"));

fan_control/src/ota.cpp

@@ -2,8 +2,12 @@
 #include "serial.hpp"
 #include <LittleFS.h>
 
-void ota_setup(const char* ssid) {
+static String ssid;
 
+void ota_setup() {
+  String mac = WiFi.macAddress();
+  mac.replace(":","_");
+  ssid = String("fan_") + mac;
   DEBUG_OUT.println("Booting");
   boolean result = WiFi.softAP(ssid);
   while (result == false) {