ESP32 | OTA更新| spiffs中的配置文件

Question

我正在创建一个项目，我想通过从服务器下载更新数据来进行自动更新（固件和Spiffs Update），我做到了，它有效，但是我有一些问题，因为设备配置（WiFi密码，SSID等） ）保存在Spiffs分区中。

但是，您可以猜到，使用.bin映像更新spiffs将从配置中删除文件。我想出了在更新Spiffs之前将配置加载到RAM中的想法，然后在更新后使用先前已加载到RAM的数据覆盖已更新的配置文件。

但是问题在于解决方案是在重新启动板后，配置文件具有更新数据，而不是RAM覆盖。但是，当板启动5-10次时，从RAM读取的实际配置数据突然出现在配置文件中。 这有点有问题，它不应是软件中应包含的解决方案，因为它可能并不总是在所有板上加载。

有人知道您在重新启动板之前可以有效地覆盖更新数据吗？

我会补充说，我使用默认的内存分区布局：

# Name,   Type, SubType, Offset,  Size, Flags
nvs,      data, nvs,     0x9000,  0x5000,
otadata,  data, ota,     0xe000,  0x2000,
app0,     app,  ota_0,   0x10000, 0x140000,
app1,     app,  ota_1,   0x150000,0x140000,
spiffs,   data, spiffs,  0x290000,0x170000,

是代码：

void makeUpdate(String host, String bin, int command = 0)
{
    WiFiClientSecure client;
    client.setCACert(github_cert);

    long contentLength = 0;
    bool isValidContentType = false;

    Serial.println("Connecting to: " + String(host));
    if (client.connect(host.c_str(), PORT)){
        Serial.println("Fetching Bin: " + String(bin));

        client.print(String("GET ") + bin + " HTTP/1.1\r\n" +
                     "Host: " + host + "\r\n" +
                     "Cache-Control: no-cache\r\n" +
                     "Connection: close\r\n\r\n");

        unsigned long timeout = millis();
        while (client.available() == 0){
            if (millis() - timeout > 5000){
                Serial.println("Client Timeout !");
                client.stop();
                return;
            }
        }

        while (client.available()){
            String line = client.readStringUntil('\n');
            line.trim();

            if (!line.length()) break;
            if (line.startsWith("HTTP/1.1")){
                if (line.indexOf("200") < 0){
                    Serial.println("Got a non 200 status code from server. Exiting OTA Update.");
                    break;
                }
            }
            if (line.startsWith("Content-Length: ")){
                contentLength = atol((this->getHeaderValue(line, "Content-Length: ")).c_str());
                Serial.println("Got " + String(contentLength) + " bytes from server");
            }
            if (line.startsWith("Content-Type: ")){
                String contentType = this->getHeaderValue(line, "Content-Type: ");
                Serial.println("Got " + contentType + " payload.");
                if (contentType == "application/octet-stream") isValidContentType = true;
            }
        }
    }
    else Serial.println("Connection to " + String(host) + " failed. Please check your setup");

    Serial.println("contentLength : " + String(contentLength) + ", isValidContentType : " + String(isValidContentType));

    String configFileSave = "";
    if (contentLength && isValidContentType){

//*************** This is read config file **************************

        if (command == U_SPIFFS){
            Serial.printf("Reading config file: %s\r\n", CONFIG_FILE);

            File file = SPIFFS.open(CONFIG_FILE);
            if (!file || file.isDirectory()){
                Serial.println("======Failed to open config file======");
                return;
            }
            configFileSave = file.readString();

            file.close();
            Serial.println("--Configuration file reading complete--");
        }

//*************** This is read config file **************************

        bool canBegin = Update.begin(contentLength, command, LED_BUILTIN, HIGH);

        if (canBegin){
            Serial.println("Begin OTA. This may take 2 - 5 mins to complete. Things might be quite for a while.. Patience!");
            size_t written = Update.writeStream(client);

            if (written == contentLength) Serial.println("Written : " + String(written) + " successfully");
            else Serial.println("Written only : " + String(written) + "/" + String(contentLength) + ". Retry?");

            if (Update.end()){
                Serial.println("OTA done!");
                if (Update.isFinished()){

//*************** This is write config file **************************

                    if (command == U_SPIFFS){
                        Serial.printf("Writing config file: %s\r\n", CONFIG_FILE);

                        File file = SPIFFS.open(CONFIG_FILE, FILE_WRITE);
                        if (!file || file.isDirectory()){
                            Serial.println("======Failed to open config file======");
                            return;
                        }
                        if (!file.println(configFileSave)){
                            Serial.println("======Failed to write data to config file======");
                            return;
                        }

                        file.close();
                        Serial.println("--Completed writing data to the configuration file");

                        File f = SPIFFS.open(CONFIG_FILE, FILE_READ);
                        if (!f || f.isDirectory()){
                            Serial.println("======Failed to open config file======");
                            return;
                        }
                        String configFile = f.readString();
                        Serial.print("===Config File: ");
                        Serial.println(configFile);
                        f.close();
                    }

//*************** This is write config file **************************


                    Serial.println("Update successfully completed. Rebooting.");
                    // ESP.restart();
                }
                else Serial.println("Update not finished? Something went wrong!");
            }
            else Serial.println("Error Occurred. Error #: " + String(Update.getError()));
        }
        else{
            Serial.println("Not enough space to begin OTA");
            client.flush();
        }
    }
    else{
        Serial.println("There was no content in the response");
        client.flush();
    }
}

Answer 1

我在搜索遇到的类似问题时遇到了这个问题。对我来说，问题是在开始更新之前，我没有在启用SPIFSS图像。

spiffs.end（）;在启动OTA更新之前，然后spiffs.begin（）;一旦OTA更新完成。

在我的情况下，用户正在从Spiffs提供的HTML页面启动更新，因此需要在实际启动更新之前加载这些更新，因此将其添加到相关的HTML页面的末尾。

<script>
$(document).ready(function() {
    $.post('/url-to-start-update', {}, function(response) {
        // Ignore the response
    });
});
</script>