Yes I have it working.
Just send the commands "/?!<CR><LF>" and "<ACK>050<CR><LF>" and read the response back.
I used the left part of schematic and connected the RX and TX directly to the atmega328.

@electrik my meter don't have a physical communication port, so I have to use the optic interface

I have problems too with the linux gateway

link text

Thanks.
I use a MQTT gateway between the node and the domoticz.
It seems that I have no choice than create two childs, one for each tariff.

I have the same question.
How to display two tarifs?

Hi. Do you have unassembled pcbs to sell?

JLCPCB made good and cheap pcbs

I have almost working this communication.

Comercial optical probes like this are expensive:
Optical probe

So I build a optical probe based on this schematic

Communication protocol tested on my meter:

Baudrate: 300 bps, 7 bits, parity even, 1 stop bit
Send:     /?!<CR><LF>         (wake-up and sign-on)
Receive:  /XXX5YYYYY<CR><LF>  (XXX is the manufacturer ID; YYYYY is the meter ID; 5 is the new baudrate = 9600 bps)
Send:     <ACK>050<CR><LF>    (send ack; reading mode)
Baudrate: 9600 bps, 7 bits, parity even, 1 stop bit
Received: C.1(201236731.0(01:39 25-08-18)
          1.8.1(0004398506*Wh)
          1.8.2(0000000000*Wh)
          1.8.3(0008198809*Wh)
          1.8.4(0000000000*Wh)
          1.8.5(0000000000*Wh)
          1.8(0012597315*Wh)
          2.8(0000000000*Wh)
          !
          D

Now I only have to parse the values of tarif 1 (1.8.1), tarif 3 (1.8.3), and total (1.8)

Ok, I understand now that the modules are measuring the noise signal strenght before sending someting.
Apparently the noise level is high, but with the other gateway I get low values.
It seems to be the linux gateway that is generating the noise ???
The RFM69 is powered by a separated LDO and capacitors, so I don't think it is a power supply problem.

The RFM69 linux driver is the same that arduino RFM69 driver? Could be some missing register parameterization?

Hello,
I'm planning to build a MySensor node to read my energy meter using the optic interface.
That interface communicates through the protocol IEC62056-21 / IEC1107

Anyone have already used this procotol?

It is possible to have both of them in a ESP8266 gateway?
I want to use MQTT to control the nodes but I need too the ethernet to update FOTA nodes with Myscontroller.