Minor easy fix:
with $CFG->mnet_rpcdebug = true;
mnet/xmlrpc/client.php's mnet_xmlrpc_client::send() should dump raw comms into err log like so:
$timestamp_send = time();
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mnet_debug("about to send the curl request");
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$this->rawresponse = curl_exec($httprequest);
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mnet_debug("managed to complete a curl request");
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$timestamp_receive = time();
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+ mnet_debug('raw response: '.$this->rawresponse);
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