ESP learning problem record

1. Arduino ESP32 development environment

   Method 1： Official installation method
   Method 2： Manual installation method
   Both ways are through github download , Will fail

   Method 3： Provided here Another way
   This method has packaged all the tools , Direct installation （arduino_esp32 The version is 2.0.3）

   If you need to use an updated version, you need to use the following methods ：
   Method 4： At present, there are two steps to be used github：arduino_esp32 The code base and Compiler tools （ The solution is to bypass github Implementation download ）

   The code base can be accessed through Code cloud download code base
   The compilation tool is through get.py Go to github download , Can be json In the document url Change to a downloadable address
   

   PS Many posts say that you can also download through Xunlei and other download tools , No attempt

2. esp_now_add_peer Call error Report error as E (109) perhaps E (110)

   resolvent
   By way of ifidx Print It is found that the value is

     Serial.println(" before");
     Serial.println(peerInfo.ifidx);
     peerInfo.ifidx = WIFI_IF_STA;
     Serial.println(" after");
     Serial.println(peerInfo.ifidx);
   

   22:03:42.883 -> before
   22:03:42.883 -> 1073338336
   22:03:42.883 -> after
   22:03:42.883 -> 0

   Question why ： Randomize the initial value of local variables . But I don't know this 1073338336 What do you mean Every time you restart it .