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v2.1.0

v2.1.0: Version 2.1.0(116b762)
@wujiangang wujiangang tagged this 05 May 10:01 
### System
1. Fix and update the license;
2. Add definitions of ROM functions;
3. Add efuse mac crc, save efuse mac into the system parameter area of flash, as a backup mac;
4. Implement `uart_div_modify`, which can support a 32-bit DivLatchValue in the SDK instead of the ROM one, and also remove `uart_div_modify` from the ld file;
5. Reduce iRAM usage by transferring some functions to flash；
    - add weak function `void user_spi_flash_dio_to_qio_pre_init(void)`. If the dio to qio flash mode is not used, users can add an empty `user_spi_flash_dio_to_qio_pre_init` on the application side to reduce iRAM usage;
6. Fix WDT in system_restart;
7. Fix Write & Read issue in SPI overlap mode;
8. Support 8MB & 16MB spi flash;
9. Update boot v1.7;
    - Support 8MB & 16MB spi flash;
    - Try boot the first bin for 3 times. If it fails, then boot the backup bin;
10. Fix http packet error, BBP301;
11. Support long periods of deep sleep;
12. Fix NMI handle crash on unaligned memory access, BBP309;

### Lwip
1. Add set and get dns server APIs:
    - espconn_dns_setserver
    - espconn_dns_getserver
2. Fix 2038 overflow bug in sntp_get_current_timestamp;
3. Fix MTU negotiate bug;

### AT
1. Add new commands, AT+UART? and AT+UART_DEF?;
2. Add new command, AT+SYSRAM?;
3. Add new commands, AT+SYSIO series;
4. Add new command, AT+CWHOSTNAME;
5. Add new command, AT+SYSADC?;
6. Add new commands, AT+CIPSNTPCFG and AT+CIPSNTPTIME;
7. Add new commands, AT+CIPDNS_CUR and AT+CIPDNS_DEF;
8. Support a maximum of 8 stations;
9. Modify keepalive count to 3 times;
10. Fix scan hidden ssid issue in AT+CWLAP;
11. Fix the issue of the UART stop bit being 0 when queried for the first time;
12. Fix MAC addr conflict in AP+STA mode;
13. Add new commands, AT+RFAUTOTRACE;

### WiFi
1. Optimize the RF frequency calibration workflow, having the frequency trace disabled by default;
    - users can call `system_phy_freq_trace_enable` in `user_rf_pre_init` to enable it;
2. Update libphy.a to version 1134_0;
3. Allow sending a broadcast ESP-NOW packet, but make sure that the packet is unencrypted;
4. Fix soft queue error;
5. Fix EVENT_STAMODE_AUTHMODE_CHANGE event mode info;
6. Fix lmac assert;
7. Fix bug in sniffer mode;
8. Fix arp loss continously issue;
9. Fix bug in WiFi event;
    - auth mode changed event cannot be throw when station is in the process of scanning;
    - error old auth mode and new auth mode;
    - op mode change process cannot be blocked, so add an event to notify the caller that op mode is changed;
10. Fix the bug in mic failure handler;
11. Fix the bug which causes failure of connection to an AP with shared WEP;
12. Fix the bug which causes failure of connection to an AP with hidden ssid;
13. Fix softAP deauth;
14. Fix reconnect policy when trying to connect to an AP that does not exist;
15. Fix scan issue;
16. Fix extra bytes in UDP broadcast packet, BBP310;
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