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In Lorawan app of ASR6501, I have to change default delays of Joining to 4990 from 5000 to join TTN, and also doesn't receive downlink after joining after many trial values of rx1 delay.
Please help me to solve this time synchronization issue.

Thank You

arm-none-eabi-ar.exe: creating .\CortexM0p\ARM_GCC_541\Debug\pingpong.a
arm-none-eabi-gcc.exe -Wl,--start-group -o D:\TiYun\Fork\alios-asr-lora\projects\Creator\ASR6501\pingpong.cydsn\CortexM0p\ARM_GCC_541\Debug\pingpong.elf .\CortexM0p\ARM_GCC_541\Debug\printf.o .\CortexM0p\ARM_GCC_541\Debug\uart_port.o .\CortexM0p\ARM_GCC_541\Debug\asr_board.o .\CortexM0p\ARM_GCC_541\Debug\gpio.o .\CortexM0p\ARM_GCC_541\Debug\gpio-board.o .\CortexM0p\ARM_GCC_541\Debug\spi-board.o .\CortexM0p\ARM_GCC_541\Debug\gpio_irq.o .\CortexM0p\ARM_GCC_541\Debug\delay.o .\CortexM0p\ARM_GCC_541\Debug\low_power.o .\CortexM0p\ARM_GCC_541\Debug\utilities.o .\CortexM0p\ARM_GCC_541\Debug\sx126x.o .\CortexM0p\ARM_GCC_541\Debug\radio.o .\CortexM0p\ARM_GCC_541\Debug\main.o .\CortexM0p\ARM_GCC_541\Debug\pingpong.o .\CortexM0p\ARM_GCC_541\Debug\cyfitter_cfg.o .\CortexM0p\ARM_GCC_541\Debug\cybootloader.o .\CortexM0p\ARM_GCC_541\Debug\cymetadata.o .\CortexM0p\ARM_GCC_541\Debug\Cm0plusStart.o .\CortexM0p\ARM_GCC_541\Debug\port_s.o .\CortexM0p\ARM_GCC_541\Debug\pingpong.a -mcpu=cortex-m0plus -mthumb -L Generated_Source\PSoC4 .\AsrLib.a -Wl,-Map,.\CortexM0p\ARM_GCC_541\Debug/pingpong.map -T Generated_Source\PSoC4\cm0plusgcc.ld -specs=nano.specs -Wl,--gc-sections -Wl,--wrap=printf -Wl,--wrap=fflush -Wl,--wrap=sprintf -Wl,--wrap=snprintf -g -ffunction-sections -Os -ffat-lto-objects -Wl,--end-group
.\AsrLib.a(lorawan_port.o): In function enter_stop_mode': D:\msys32\home\ruilinhao\new_git\checkin\alios-lora\projects\Creator\ASR6501\alios_small.cydsn\AsrLib.cylib/..\..\..\..\..\board\asr6501\src/lorawan_port.c:159: undefined reference to SysTick_IRQ'
collect2.exe: error: ld returned 1 exit status
The command 'arm-none-eabi-gcc.exe' failed with exit code '1'.
--------------- Build Failed: 02/02/2021 10:34:27 --------------

the project(path: alios-asr-lora-master\projects\Creator\CY8CKIT-149\alios.cydsn) lost flash_port.c and hw.c file.

I receive the following error when building Release Configuration v4.4.
The Debug Configuration builds properly.

Now the type field of the AT+DTRX command format is:
TYPE：1Byte, represent the download transfer type
Bit0：0-unconfirm，1-confirm
Bit1：0-non-ACK，1-ACK
Bit2：0-non-carry，1-carry，indicate if download data have carry the ack of LINK command.
Bit3：0-non-carry，1-carry，indicate if download data have carry the ack of TIME command. Only when the bit is 1, it means time sync success.

It would be nice to receive in Bit4 the DownLinkFramePending value, to send the uC to sleep is there is not more DownLinkFramePending.