Signalling over power line

Hello all,
I'm looking for a method to send digital, very low bitrate over power
line. The signalling must be bidirectional, at a baud rate of less than
one bit per second (can be half duplex). The power line carries 220V
RMS at a current of about 10A. The distance between the two stations is
about 10 meters. All the vendors I found produce such chips for
broadband communication, and this is an overkill for my application.

Thanks,
Avishay

.

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