knob ota bin file and config file

firmware_info.json

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+{"latest_version":"1.1.2"}

readme.txt

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+1. firmware_info.json for version < v1.1.2
+2. upgrade_info.json for version ≥ v1.1.2

upgrade_info.json

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+{"knob_version":1102,"knob_url":"https://gitee.com/laidaixi/knob_ota/raw/master/knob_v1.1.2_beta.bin","mcu_version":1001,"mcu_url":"https://gitee.com/laidaixi/mcu_ota/raw/master/H220_SPLAN_V1001.hex"}