If you want to monitor and control devices via the Internet using a microcontroller, Ethernet is the packet transport of choice. Before folks like you and I cracked the code of the commercial Ethernet ICs and applied that technology to a microcontroller, we all had to learn to deal with SLIP (Serial Line Internet Protocol), the first protocol for transferring packets using a serial link over dial-up lines, or PPP (Point-to-Point Protocol), the more elegant dial-up protocol alternative to SLIP Once you got all of that under control, you dealt with coding for a modem.
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