add support 4g -- >ppp

hc

2023-11-24 2b26ab132d1b33b91c84c6d732456200e8c5ee77

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# Locally computed:
sha256 d846066e27c3072565990745d030357aa0c278f96b7d1d4f59023347c1db8824  ser2net-3.4.tar.gz