How to Set Up Point-to-Point Communication Between Two LoRa-E5 Mini Modules?

Products & Technology LoRa
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  return(this->mod->SPIwriteStream(RADIOLIB_SX126X_CMD_SET_STANDBY, data, 1));

It seems that this line is not executing. There may be a problem with SPI.
Unfortunately, I don’t have the skills to investigate further.