Just curious about can I add NodMCU in pixhawk in telemetry port 1 as standard 433 , 915 MHz
I know there is already exist adafruit
https://ardupilot.org/copter/docs/common-esp8266-telemetry.html
Thank you 
If you are asking if you can use an ESP8266 WiFi radio on a Pixhawk sure you can. I have them on most models. I use the ESP-01 's. The only consideration with those is they need 3.3V but that’s available on Pixhawk’s and many other boards so no problem.
Don’t expect much range. 100m best.
Ways to improve the range ? Good AP will be sufficient ? How many of these modules can I connect to a AP ? I have tested previously by having different UDP port I can communicate with multiple ESP-01
Nope , actually I want to try fpv data through wifi and also fpv live streaming.
Don’t need long range like 20meter is , ohh my god. 
It’s enough for me 
Thank you 