Thank you. That was part of the problem. I resoldered all the connections and now using software serial D6/D7 as Tx /Rx on BOTH boards ( wires are crossed but pin definition is not reversed.
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Thank you. That was part of the problem. I resoldered all the connections and now using software serial D6/D7 as Tx /Rx on BOTH boards ( wires are crossed but pin definition is not reversed.