I did success with MySBootloader 1.3 beta 3 (https://github.com/mysensors/MySensorsBootloaderRF24 )
It works both arduino and OTA firmware upgrade however it takes longer to boot up (means switch to firmware) about 3-5seconds.
I'm using MYSensors 2.1.0 and MYController (http://www.mycontroller.org) on arduino pro mini 8Mhz 3.3V.

How many sensor you try at the same time?
From memory When I do firmware update for 3-4 sensors, I have to change "Tx message processing delay" to 300ms.
If it's shorter than 300ms, keep rebooting some stage.

I didn't use MYScontroller but probably it has similar setting.

@gloob
Arduino doesn't matter up to 5V so I don't mind for arduino.
If I feed same power to arduino, I need bigger LDO and also less efficiency.

@fleinze

I keep reading the article.. interesting
The module which on the link is too expensive for my project;;

@gloob
nRF module should not use over 3.6V and Li-Ion battery is 4.2V when it is full charged.

@flopp
Gateway : ESP8266 ( use 3A switching step down power module)
Node : Arduino pro mini 3V ( Arduino use battery power directly and nRF24L01 use 3.3V LDO 800mA one with 0.3V drop down )

@MiKa
Device is installed in rural area. There is only one wifi. I don't think there is jamming or interference..
I don't have RF scanner. If I couldn't find any other solution , probably I need to build RF scanner to check it..

@flopp

Whole system is Li-Ion battery powered system with solar.
Gateway has 3S2P Li-Ion battery with proper solar panel. Battery voltage never go under 11V.
Node has 1x18650 Li-Ion battery with small solar panel.
Node goes sleep mode for 10 minutes then wake up and send data within 10 second.

@flopp
At the first time I use default antenna but it was same issue so I bought exactly same long antenna. It make a little bit better but not perfect..
I knew what you are talking about. It wasn't normal so a little bit expensive compare to normal wifi antenna.

Thank for your concern.

@flopp
I use nRF+LNA+PA on both.

@fleinze
Thank you for your quick response. Well I use custom PCB which has plenty of GND area on the board.
Anyway will keep think how to make better ground for the module.

@flopp
Well I guess it was 10-15meter in the office.
Also when I check the orchard on google, it probably 25-35meter. Sorry for making confusion.

I used first 5 node + 1 gateway and it was same distance issue so I made another 5 node and 1 gateway with more capacitor but same distance problem.

The title on aliexpress is "1100-meter long-distance NRF24L01+PA+LNA wireless modules"

Sorry I put correct link. The link is the product what I bought from aliexpres.

@fleinze
Thank you for your reply. Can you share how to make better ground connection?
I made tinfoil wrap on the module and connect gold antenna connector.

Hi All,

My project has 1 gateway + 5 node with temperature sensor and it is installed in orchard.
All node is within 20meter from gateway but seems there are a lot of packet loss.
I bought module from aliexpress which is mysensors link (https://www.aliexpress.com/item/1sets-Special-promotions-1100-meter-long-distance-NRF24L01-PA-LNA-wireless-modules-with-antenna/32341792715.html)

Communication was fine in the office but when I install in the orchard it loose some data.

I did try a lot of things on the web.
Here is the list I have been try to solve the problem but no luck yet.

1. 800mA 3.3V LDO saperate Power to the module
2. 2x 10uF LDO in/out
3. 100UF Al Cap, 2x 10UF ceramic Capacitor on base board
4. 100uF , 2x 10uf On the module
5. warp the module with tinfoil
6. bigger antenna ( a little bit improved)
7. 3M corded antenaa ( no difference)
8. change mysensors config to MY_RF24_PA_LEVEL RF24_PA_MAX ( no difference)

Is there any other option?
It's really strange, the module specification is 1km but even not working properly within 20meter..
I don't think there is interference because it is installed rural area..

Sorry for bad English;;

@abmantis Interesting. Can you let me know a little bit further detail?
You mean Arduino pro mini pin 10? That pin is connected to CSN on NRF24L01.
I'm keen to find the issue why it get slow.. It took 20-30minutes to upload new firmware....

@Anduril
I did some thest.
1.3Pre.hex in 1.0.0Beta : it works with serial upload but take too long time(about an hour) to use OTA or fail.
1.1 (?) which is in 0.1.2 folder : it takes about 10 minutes and works well but doesn't work with Serial upload which is normal way to upload firmware in Arduino.
Thank you for all help.

@Anduril

Thank you! Will try tomorrow and update on this post!

@Anduril
Oh really? I did use MYSBootloaderV13pre.hex.
Can you let me know which one you use?
Thanks!

@abmantis
You did post following 2months ago and I have same problem too.
If you solve the problem, please share it.

Yeah, the bootloader works well with the v2.0 release.
The major issue it has currently is that sometimes it takes quite a long time to flash a sketch. It seems that when the wireless connection is not perfect, it stops for 2 or 3 seconds multiple times. Like, send 10 packages, stop 3 seconds, send 5 packages, stop again.

Thanks.

@abmantis

I have same problem. Did you solve the problem?

It will be great. I also turn on debug..
It means driver itself is too fast to handle on atmega328??
If we can reduce delay when it fails,it will be great. 5 seconds is too much I guess.