Mission Planner Packet Error Check

#### Issue details
I had a project to analyse the characteristic antenna that i used. I took 2 parameter to analyse, it is RSSI and Packet Error Rate.
I want to know is there a feature that mission planner have to calculate the packet error that it received? If there is no, can i calculate it manually ? So i need calculate the packet that sended from pixhawk then i need to calculate too the packet that i received. There is a problem i need to generate the data first because it's using MavLink protocol.
I need parameter lie this, anyone know where i can get it?

#### Version
Mission Planner 1.3.50 - 6-10-2017

#### Platform
Antena

#### Airframe type
Fixed Wings

#### Hardware type
For the flight controller i used pixhawk and the telemetry i used 3DR Radio 433 MHz.
Antenna Ground Control System (Biquad) Antena UAV (monopole)

The issue names no source files, tests, or entry point. Start by clarifying the required packet-error definition and locating how Mission Planner receives MAVLink telemetry; done requires an agreed calculation and a reproducible check against sent and received packets.

Written by the indexing model from the issue text.