I will answer my own question. With echo interval set to 0 zero it does reconnect. However I have now set it back to 30 seconds as the DSL line has reset and now apparently PPP session stays up while...

PPP session just dropped again after 1:30 minutes download (537mb) that is 3 echo requests of the TP-Link router. TP-Link has an echo request of 30 seconds. If the PPP server is set to drop at 3 echo...