I would like to send some commands to my Marantz NR1504 amplifier from my Echo. Consider that newest Marantz device with HEOS are natively interfaced with Alexa but not this one; still, it can accept commands via telnet protocol on port 23, so I was thinking to somehow take advantage of this from a custom skill but:
1) I see no available skill / tool to send telnet commands from Alexa
2) even worse, the Marantz device is not exposed on internet and it is only reachable from a local address (192.168.1.xxx), so it cannot be reached easily from - say - a lambda function.
Any idea on how to accomplish this? I was thinking of having an old android phone repurposed, installing a telnet client there and somehow having Alexa invoking it but still I can't think of a way to do it.