Unexpected error: Error while retrieving firmware file 'https://raw.githubusercontent.com/espressif/arduino-esp32/1.0.4/tools/sdk/bin/bootloader_dio_40m.bin': HTTPSConnectionPool(host='raw.githubusercontent.com', port=443): Max retries exceeded with url: /espressif/arduino-esp32/1.0.4/tools/sdk/bin/bootloader_dio_40m.bin (Caused by NewConnectionError('<urllib3.connection.VerifiedHTTPSConnection object at 0x0000018ACD811048>: Failed to establish a new connection: [WinError 10060] 由于连接方在一段时间后没有正确答复或连接的主机没有反应,连接尝试失败。'))