Unable to sent / receive long messages with Heltec Wireless Stick Lite (V3)

[FlavorFx]

I have two Heltec Wireless Stick Lite (V3), SX1262 board and took these sample programs to sent and receive messages:

• https://github.com/jgromes/RadioLib/blob/master/examples/SX126x/SX126x_Transmit_Blocking/SX126x_Transmit_Blocking.ino
• https://github.com/jgromes/RadioLib/blob/master/examples/SX126x/SX126x_Receive_Blocking/SX126x_Receive_Blocking.ino

The communication between these boards work fine but when I extend the message size from 39 to 53 characters, the communication stopped working. Same behavior with another board with SX1276. I have no glue, why. With sandeepmistry's lora lib the Sx1276 communication works fine but it does not support SX1262. I compared the default setting of each lib but no success.

Any hint is appreciated.

[jgromes]

when I extend the message size from 39 to 53 characters, the communication stopped working

What exactly do you mean by that? Does the transmitter/receiver return some error code? And does the issue persist when using interrupt receive?

[jgromes]

It's impossible to know without seeing the code/configuration on both sides. When only using RadioLib, SX127x will be able to talk to SX126x with the default settings, but I have no idea what is the configuration of your other library. Sync word is not the only possible configuration, you can have different header configuration, IQ inversion etc.

[FlavorFx]

Pls have a look to these files: https://gist.github.com/FlavorFx/04349b7e4622536c561d3d8167277d80.
"main with loralib.cpp" works fine with my gateway. "SX126x_Tx" and "SX1262Rx_IRQ" works fine each other, but "SX1276_Tx" does not reach my gateway nor my receiver.

[jgromes]

You don't seem to be configuring anything apart from the sync word. What is the default frequency of your non-RadioLib receiver and the gateway? What are its spreading factors, bandwidths, coding rates, ...?

This page has the default configuration for RadioLib: https://github.com/jgromes/RadioLib/wiki/Default-configuration

[FlavorFx]

I checked the defaults and noticed a difference of the sync word. All parameters looks equal. All devices works with 868MHz. I'll double check the parameter again.

[FlavorFx]

Finally, it works. I took care to use the same settings of lora configuration. Thanks a lot for you support.