opkg update
opkg list | grep rtty
opkg install rtty-nossl

echo 'src-git rtty https://github.com/zhaojh329/rtty.git;openwrt-14-15' >> feeds.conf.default

echo 'src-git rtty https://github.com/zhaojh329/rtty.git;openwrt-lede' >> feeds.conf.default

echo 'src-git rtty https://github.com/zhaojh329/rtty.git;openwrt-18' >> feeds.conf.default

./scripts/feeds uninstall -a
./scripts/feeds update rtty
./scripts/feeds install -a -f -p rtty
./scripts/feeds install -a

./scripts/feeds update -a
./scripts/feeds install -a

Utilities  --->
    Terminal  --->
        <*> rtty-mbedtls............................ A reverse proxy WebTTY (mbedtls)
        < > rtty-nossl............................... A reverse proxy WebTTY (NO SSL)
        < > rtty-openssl............................ A reverse proxy WebTTY (openssl)
        < > rtty-wolfssl............................ A reverse proxy WebTTY (wolfssl)

uci add rtty rtty   # If it is configured for the first time
uci set rtty.@rtty[0].host='your server host'
uci set rtty.@rtty[0].port='your server port'

uci set rtty.@rtty[0].id='your-device-id'

uci set rtty.@rtty[0].description='My device'

uci set rtty.@rtty[0].ssl='1'

uci set rtty.@rtty[0].token='your-token'

uci commit
/etc/init.d/rtty restart