【Realtek sdk-3.4.14b】RTL8197FH-VG 2.4G WiFi 设置11b/g模式，终端设备固定到11b模式连接失败问题分析及解决

问题描述

        2.4G 11b/g 模式，终端设备强制设置11b模式，发现无法扫描到wifi SSID,更换终端设备发现有部分设备可以扫描到，但依然无法连接

问题分析

      查看2.4G mib配置

root@smart4g:/# cat /proc/wlan1/mib_all
  Make info: v3.8.0 (2017-12-26)
  Realtek Smart Roaming v3.4
  Realtek firmware version: 3.0,  built time: 03-20 10:29
  Dot11RFEntry...
    dot11channel: 1
    dot11ch_low: 0
    dot11ch_hi: 0
    pwrlevelCCK_A: 5959595858585858585757575757
    pwrlevelCCK_B: 4f4f4f4f4f4f4f4f4f4f4f4f4f4f
    pwrlevelHT40_1S_A: 4e4e4e4e4e4e4e4e4e4e4e4e4e4e
    pwrlevelHT40_1S_B: 4747474949494949494949494949
    pwrdiffHT40_2S: 0000000000000000000000000000
    pwrdiffHT20: 0000000000000000000000000000
    pwrdiffOFDM: 0000000000000000000000000000
    pwrlevel_TSSIHT40_1S_A: 1f1f1f1c1c1c1c1c1c1616161616
    pwrlevel_TSSIHT40_1S_B: 2020201818181818181b1b1b1b1b
    disable_txpwrlmt : 1
    txpwr_lmt_index : 0
    regdomain : 3
    txpwr_lmt_CCK : 0
    txpwr_lmt_OFDM : 0
    txpwr_lmt_HT1