docs(sx127x): enhance documentation and update default configurations by arjav1528 · Pull Request #18493 · apache/nuttx

arjav1528 · 2026-03-04T15:31:31Z

Fixes: #17447

Updated the SX127X demo documentation to include an overview, default configuration settings, short-range FSK testing recommendations, and troubleshooting tips. The default TX power has been changed from 14 dBm to 17 dBm, and CRC is now enabled by default. These changes aim to improve user experience and ensure robust communication for the SX127X radio driver.

Summary

Raise the default SX127X TX power by setting CONFIG_LPWAN_SX127X_TXPOWER_DEFAULT from 14 dBm to 17 dBm.
Enable CRC by default by setting CONFIG_LPWAN_SX127X_CRCON from 0 to 1.
Expand sx127x_demo documentation with defaults, short-range FSK recommendations, and troubleshooting, following the behavior observed and recommendations in apache/nuttx#17447.

Impact

SX127X users get a stronger and more reliable default link (higher RSSI at short range).
CRC-on by default improves payload integrity by rejecting corrupted frames.
Boards that already override TX power or CRC remain unaffected; users needing CRC off can still explicitly set CONFIG_LPWAN_SX127X_CRCON=0.

linguini1

Please include testing. Do you have this hardware to test with?

arjav1528 · 2026-03-05T05:04:46Z

Please include testing. Do you have this hardware to test with?

Nope

acassis · 2026-03-05T10:58:45Z

@linguini1 we commented at #17447 I agreed that he could modify the Kconfig without testing in real hardware, because I already tested it. BTW, I can retest here to have peace of mind

arjav1528 · 2026-03-05T12:44:56Z

@linguini1 we commented at #17447 I agreed that he could modify the Kconfig without testing in real hardware, because I already tested it. BTW, I can retest here to have peace of mind

Could you please restart the workflows, seems like a timeout error

acassis · 2026-03-05T12:52:50Z

@linguini1 we commented at #17447 I agreed that he could modify the Kconfig without testing in real hardware, because I already tested it. BTW, I can retest here to have peace of mind

Could you please restart the workflows, seems like a timeout error

@arjav1528 actually it is not timeout error. Since you changed the default values in the Kconfig some boards using this driver need to be updated (normalized), please use this command for each board and profile listed in the error:

./tools/refresh.sh --silent boardname:profilename

ie

./tools/refresh.sh --silent esp32-devkitc:bmp280

Then create a commit with the updated board profiles

arjav1528 · 2026-03-05T13:41:51Z

@linguini1 we commented at #17447 I agreed that he could modify the Kconfig without testing in real hardware, because I already tested it. BTW, I can retest here to have peace of mind

Could you please restart the workflows, seems like a timeout error

@arjav1528 actually it is not timeout error. Since you changed the default values in the Kconfig some boards using this driver need to be updated (normalized), please use this command for each board and profile listed in the error:
./tools/refresh.sh --silent boardname:profilename
ie
./tools/refresh.sh --silent esp32-devkitc:bmp280
Then create a commit with the updated board profiles

@acassis I guess this is a timeout issue only as I ran the commands which you suggested on every board profile that uses SX127X drivers. All of them existed with code 0, and neither of them produced any deconfig changes
could you please check the CI logs and try restarting the workflows.
btw attached the logs in the PR desc

acassis · 2026-03-05T13:47:47Z

@linguini1 we commented at #17447 I agreed that he could modify the Kconfig without testing in real hardware, because I already tested it. BTW, I can retest here to have peace of mind

Could you please restart the workflows, seems like a timeout error

@arjav1528 actually it is not timeout error. Since you changed the default values in the Kconfig some boards using this driver need to be updated (normalized), please use this command for each board and profile listed in the error:
./tools/refresh.sh --silent boardname:profilename
ie
./tools/refresh.sh --silent esp32-devkitc:bmp280
Then create a commit with the updated board profiles
@acassis I guess this is a timeout issue only as I ran the commands which you suggested on every board profile that uses SX127X drivers. All of them existed with code 0, and neither of them produced any deconfig changes could you please check the CI logs and try restarting the workflows. btw attached the logs in the PR desc

@arjav1528 please look the logs, there are real errors:

board/esp32_bringup.c: In function 'esp32_bringup':
Error: board/esp32_bringup.c:351:9: error: implicit declaration of function 'btn_lower_initialize'; did you mean 'nullmtd_initialize'? [-Wimplicit-function-declaration]
  351 |   ret = btn_lower_initialize("/dev/buttons");
      |         ^~~~~~~~~~~~~~~~~~~~
      |         nullmtd_initialize
make[1]: *** [/github/workspace/sources/nuttx/boards/Board.mk:83: esp32_bringup.o] Error 1
make[1]: Target 'libboard.a' not remade because of errors.
make: *** [tools/LibTargets.mk:89: arch/xtensa/src/board/libboard.a] Error 2
make: Target 'all' not remade because of errors.
/github/workspace/sources/nuttx/tools/testbuild.sh: line 385: /github/workspace/sources/nuttx/../nuttx/nuttx.manifest: No such file or directory
  [1/1] Normalize esp32-wrover-kit/buttons
19d18
< CONFIG_ARCH_IRQBUTTONS=y
35d33
< CONFIG_INPUT_BUTTONS_LOWER=y
Saving the new configuration file
HEAD detached at pull/18493/merge
Changes not staged for commit:
  (use "git add <file>..." to update what will be committed)
  (use "git restore <file>..." to discard changes in working directory)
	modified:   boards/xtensa/esp32/esp32-devkitc/configs/bmp280/defconfig
	modified:   boards/xtensa/esp32/esp32-devkitc/configs/buttons/defconfig
	modified:   boards/xtensa/esp32/esp32-ethernet-kit/configs/buttons/defconfig
	modified:   boards/xtensa/esp32/esp32-lyrat/configs/buttons/defconfig
	modified:   boards/xtensa/esp32/esp32-wrover-kit/configs/buttons/defconfig
	modified:   boards/xtensa/esp32/esp32-wrover-kit/configs/lua/defconfig

Maybe it was generated by some other user, please move to upstream branch, run git pull, move back to your branch and rebase with upstream to see if it will help.

@simbit18 did you see this error in the mainline?

linguini1 · 2026-03-05T14:09:26Z

@linguini1 we commented at #17447 I agreed that he could modify the Kconfig without testing in real hardware, because I already tested it. BTW, I can retest here to have peace of mind

I missed that! Sounds good!

@acassis

To be tested by @acassis

simbit18 · 2026-03-05T15:25:37Z

@linguini1 we commented at #17447 I agreed that he could modify the Kconfig without testing in real hardware, because I already tested it. BTW, I can retest here to have peace of mind

Could you please restart the workflows, seems like a timeout error

@arjav1528 actually it is not timeout error. Since you changed the default values in the Kconfig some boards using this driver need to be updated (normalized), please use this command for each board and profile listed in the error:
./tools/refresh.sh --silent boardname:profilename
ie
./tools/refresh.sh --silent esp32-devkitc:bmp280
Then create a commit with the updated board profiles
@acassis I guess this is a timeout issue only as I ran the commands which you suggested on every board profile that uses SX127X drivers. All of them existed with code 0, and neither of them produced any deconfig changes could you please check the CI logs and try restarting the workflows. btw attached the logs in the PR desc
@arjav1528 please look the logs, there are real errors:
board/esp32_bringup.c: In function 'esp32_bringup':
Error: board/esp32_bringup.c:351:9: error: implicit declaration of function 'btn_lower_initialize'; did you mean 'nullmtd_initialize'? [-Wimplicit-function-declaration]
  351 |   ret = btn_lower_initialize("/dev/buttons");
      |         ^~~~~~~~~~~~~~~~~~~~
      |         nullmtd_initialize
make[1]: *** [/github/workspace/sources/nuttx/boards/Board.mk:83: esp32_bringup.o] Error 1
make[1]: Target 'libboard.a' not remade because of errors.
make: *** [tools/LibTargets.mk:89: arch/xtensa/src/board/libboard.a] Error 2
make: Target 'all' not remade because of errors.
/github/workspace/sources/nuttx/tools/testbuild.sh: line 385: /github/workspace/sources/nuttx/../nuttx/nuttx.manifest: No such file or directory
  [1/1] Normalize esp32-wrover-kit/buttons
19d18
< CONFIG_ARCH_IRQBUTTONS=y
35d33
< CONFIG_INPUT_BUTTONS_LOWER=y
Saving the new configuration file
HEAD detached at pull/18493/merge
Changes not staged for commit:
  (use "git add <file>..." to update what will be committed)
  (use "git restore <file>..." to discard changes in working directory)
	modified:   boards/xtensa/esp32/esp32-devkitc/configs/bmp280/defconfig
	modified:   boards/xtensa/esp32/esp32-devkitc/configs/buttons/defconfig
	modified:   boards/xtensa/esp32/esp32-ethernet-kit/configs/buttons/defconfig
	modified:   boards/xtensa/esp32/esp32-lyrat/configs/buttons/defconfig
	modified:   boards/xtensa/esp32/esp32-wrover-kit/configs/buttons/defconfig
	modified:   boards/xtensa/esp32/esp32-wrover-kit/configs/lua/defconfig
Maybe it was generated by some other user, please move to upstream branch, run git pull, move back to your branch and rebase with upstream to see if it will help.

@simbit18 did you see this error in the mainline?

@arjav1528 please rebase

arjav1528 · 2026-03-05T15:37:03Z

@linguini1 we commented at #17447 I agreed that he could modify the Kconfig without testing in real hardware, because I already tested it. BTW, I can retest here to have peace of mind

Could you please restart the workflows, seems like a timeout error

@arjav1528 actually it is not timeout error. Since you changed the default values in the Kconfig some boards using this driver need to be updated (normalized), please use this command for each board and profile listed in the error:
./tools/refresh.sh --silent boardname:profilename
ie
./tools/refresh.sh --silent esp32-devkitc:bmp280
Then create a commit with the updated board profiles
@acassis I guess this is a timeout issue only as I ran the commands which you suggested on every board profile that uses SX127X drivers. All of them existed with code 0, and neither of them produced any deconfig changes could you please check the CI logs and try restarting the workflows. btw attached the logs in the PR desc
@arjav1528 please look the logs, there are real errors:
board/esp32_bringup.c: In function 'esp32_bringup':
Error: board/esp32_bringup.c:351:9: error: implicit declaration of function 'btn_lower_initialize'; did you mean 'nullmtd_initialize'? [-Wimplicit-function-declaration]
  351 |   ret = btn_lower_initialize("/dev/buttons");
      |         ^~~~~~~~~~~~~~~~~~~~
      |         nullmtd_initialize
make[1]: *** [/github/workspace/sources/nuttx/boards/Board.mk:83: esp32_bringup.o] Error 1
make[1]: Target 'libboard.a' not remade because of errors.
make: *** [tools/LibTargets.mk:89: arch/xtensa/src/board/libboard.a] Error 2
make: Target 'all' not remade because of errors.
/github/workspace/sources/nuttx/tools/testbuild.sh: line 385: /github/workspace/sources/nuttx/../nuttx/nuttx.manifest: No such file or directory
  [1/1] Normalize esp32-wrover-kit/buttons
19d18
< CONFIG_ARCH_IRQBUTTONS=y
35d33
< CONFIG_INPUT_BUTTONS_LOWER=y
Saving the new configuration file
HEAD detached at pull/18493/merge
Changes not staged for commit:
  (use "git add <file>..." to update what will be committed)
  (use "git restore <file>..." to discard changes in working directory)
	modified:   boards/xtensa/esp32/esp32-devkitc/configs/bmp280/defconfig
	modified:   boards/xtensa/esp32/esp32-devkitc/configs/buttons/defconfig
	modified:   boards/xtensa/esp32/esp32-ethernet-kit/configs/buttons/defconfig
	modified:   boards/xtensa/esp32/esp32-lyrat/configs/buttons/defconfig
	modified:   boards/xtensa/esp32/esp32-wrover-kit/configs/buttons/defconfig
	modified:   boards/xtensa/esp32/esp32-wrover-kit/configs/lua/defconfig
Maybe it was generated by some other user, please move to upstream branch, run git pull, move back to your branch and rebase with upstream to see if it will help.
@simbit18 did you see this error in the mainline?
@arjav1528 please rebase

done, builds pass now, @acassis @simbit18 @linguini1 thank you for helping

arjav1528 · 2026-03-05T15:39:48Z

ig now its a timeout issue 😔

simbit18 · 2026-03-05T15:45:11Z

@arjav1528, let's wait for the msvc and msys2 jobs to complete, then I'll restart.

arjav1528 · 2026-03-05T15:46:04Z

@arjav1528, let's wait for the msvc and msys2 jobs to complete, then I'll restart.

sure, no problem

simbit18 · 2026-03-05T18:08:41Z

GitHub is having problems! :)

Multiple services are affected, service degradation
https://www.githubstatus.com/incidents/g5gnt5l5hf56

simbit18 · 2026-03-06T17:18:55Z

@arjav1528 After this PR #18502 is merged,

you must remove all defconfig files that do not relate to your PR

and perform a rebase.

arjav1528 · 2026-03-06T17:22:17Z

@arjav1528 After this PR #18502 is merged,

you must remove all defconfig files that do not relate to your PR

and perform a rebase.

sure, will do that

cederom · 2026-03-06T17:24:23Z

@acassis: @linguini1 we commented at #17447 I agreed that he could modify the Kconfig without testing in real hardware, because I already tested it. BTW, I can retest here to have peace of mind

Yes @acassis please attach build and runtime logs to PR description thanks! <3

cederom

Thanks @arjav1528 :-)

There are three functional changes in this PR, please provide each change as separate commit with proper description.
Build and runtime tests are mandatory, if @acassis can provide them as your guide this is okay too :-)
Why removing CONFIG_ARCH_IRQBUTTONS from buttons configs? I see no explanation in the git commit message.

acassis · 2026-03-06T17:36:31Z

Thanks @arjav1528 :-)

* There are three functional changes in this PR, please provide each change as separate commit with proper description.

* Build and runtime tests are mandatory, if @acassis can provide them as your guide this is okay too :-)

* Why removing `CONFIG_ARCH_IRQBUTTONS` from `buttons` configs? I see no explanation in the git commit message.

@arjav1528 @cederom yes, boards modifications, documentation and driver Kconfig should be in separated commits.

I think he tried to remove CONFIG_ARCH_IRQBUTTONS to fix the issue in the ESP32, please don't modify it.

cederom · 2026-03-06T17:42:28Z

The ESP32 fix from Espressif is already here #18502 :-) Big thank you @tmedicci :-)

We should wait until the fix is in the master, then this PR should build fine.. and we can remove unrelated esp changes and we have clean PR dedicated to doc and sx127x power (in two commits plz) :-)

acassis · 2026-03-06T20:46:13Z

@arjav1528 please update your upstream and rebase your branch to fix the previous Xtensa/ESP32 issue

Increase default TX power from 14 to 17 dBm and enable CRC by default to improve link reliability and data integrity. Signed-off-by: Arjav Patel <arjav1528@gmail.com>

Add default configuration, short-range FSK testing tips, and troubleshooting guidance for the SX127X demo example. Signed-off-by: Arjav Patel <arjav1528@gmail.com>

arjav1528 · 2026-03-07T05:10:46Z

@arjav1528 please update your upstream and rebase your branch to fix the previous Xtensa/ESP32 issue

done

acassis · 2026-03-08T18:43:25Z

@arjav1528 I confirmed everything is working as expected:

Board 1:

*** Booting NuttX ***                                                        
I (19) boot: chip revision: v1.1                                             
I (19) boot.esp32: SPI Speed      : 40MHz                                    
I (19) boot.esp32: SPI Mode       : DIO                                      
I (20) boot.esp32: SPI Flash Size : 8MB                                      
I (24) boot: Enabling RNG early entropy source...                            
dram: lma 0x00001020 vma 0x3ffb2470 len 0x1bac   (7084)                      
iram: lma 0x00002bd4 vma 0x40080000 len 0x7db0   (32176)                     
padd: lma 0x0000a998 vma 0x00000000 len 0x5680   (22144)                     
imap: lma 0x00010020 vma 0x400d0020 len 0x15300  (86784)                     
padd: lma 0x00025328 vma 0x00000000 len 0xacf0   (44272)                     
dmap: lma 0x00030020 vma 0x3f400020 len 0x385c   (14428)                     
total segments stored 6                                                      
ABI (24) cpu_start: Pro cpu start user code                                       
I (24) cpu_start: cpu freq: 240000000 Hz                                          
I (24) spi_flash: detected chip: winbond                                          
I (26) spi_flash: flash io: dio                                                   
D__esp32_start: ESP32 chip revision is v1.1                                       
WARNING: NuttX supports ESP32 chip revision >= v3.0 (chip is v1.1).               
Ignoring this error and continuing because `ESP32_IGNORE_CHIP_REVISION_CHECK` is .
THIS MAY NOT WORK! DON'T USE THIS CHIP IN PRODUCTION!                             
                                                                                  
NuttShell (NSH) NuttX-12.12.0                                                     
nsh> ?                                                                            
help usage:  help [-v] [<cmd>]                                                    
                                                                                  
    .           cp          expr        mount       kill        uname             
    [           cmp         false       mv          pkill       umount            
    ?           dirname     fdinfo      pidof       sleep       unset             
    alias       df          free        printf      usleep      uptime            
    unalias     dmesg       help        ps          source      watch             
    basename    echo        hexdump     pwd         test        xd                
    break       env         ls          rm          time        wait              
    cat         exec        mkdir       rmdir       true                          
    cd          exit        mkrd        set         truncate                      
                                                                                  
Builtin Apps:                                                                     
    dd        nsh       sh        sx127x                                          
nsh> sx127x -m 1 -t                                                               
Start sx127x_demo                                                                 
FSK modulation                                                                    
Set frequency to 915000000                                                        
Set power to 20                                                                   
                                                                                  
Send 63 bytes                                                                     
wait 5 sec ...                                                                    
                                                                                  
Send 63 bytes                                                                     
wait 5 sec ...                                                                    
                                                                                  
Send 63 bytes                                                                     
wait 5 sec ...                                                                    
                                                                                  
Send 63 bytes                                                                     
wait 5 sec ...

Board 2:

*** Booting NuttX ***                                                        
I (19) boot: chip revision: v1.1                                             
I (19) boot.esp32: SPI Speed      : 40MHz                                    
I (19) boot.esp32: SPI Mode       : DIO                                      
I (20) boot.esp32: SPI Flash Size : 8MB                                      
I (24) boot: Enabling RNG early entropy source...                            
dram: lma 0x00001020 vma 0x3ffb2470 len 0x1bac   (7084)                      
iram: lma 0x00002bd4 vma 0x40080000 len 0x7db0   (32176)                     
padd: lma 0x0000a998 vma 0x00000000 len 0x5680   (22144)                     
imap: lma 0x00010020 vma 0x400d0020 len 0x15300  (86784)                     
padd: lma 0x00025328 vma 0x00000000 len 0xacf0   (44272)                     
dmap: lma 0x00030020 vma 0x3f400020 len 0x385c   (14428)                     
total segments stored 6                                                      
ABI (24) cpu_start: Pro cpu start user code                                       
I (24) cpu_start: cpu freq: 240000000 Hz                                          
I (24) spi_flash: detected chip: winbond                                          
I (26) spi_flash: flash io: dio                                                   
D__esp32_start: ESP32 chip revision is v1.1                                       
WARNING: NuttX supports ESP32 chip revision >= v3.0 (chip is v1.1).               
Ignoring this error and continuing because `ESP32_IGNORE_CHIP_REVISION_CHECK` is .
THIS MAY NOT WORK! DON'T USE THIS CHIP IN PRODUCTION!                             
                                                                                  
NuttShell (NSH) NuttX-12.12.0                                                     
nsh> uname -a                                                                     
NuttX 12.12.0 34928bdbed Mar  8 2026 15:40:30 xtensa heltec_wifi_lora32           
nsh> sx127x -m 1                                                                  
Start sx127x_demo                                                                 
FSK modulation                                                                    
Set frequency to 915000000                                                        
Set power to 20                                                                   
Waiting for data                                                                  
                                                                                  
Received:                                                                         
SNR  = 0                                                                          
RSSI = -74                                                                        
len  = 63                                                                         
0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09                                 
0x0a 0x0b 0x0c 0x0d 0x0e 0x0f 0x10 0x11 0x12 0x13                                 
0x14 0x15 0x16 0x17 0x18 0x19 0x1a 0x1b 0x1c 0x1d                                 
0x1e 0x1f 0x20 0x21 0x22 0x23 0x24 0x25 0x26 0x27                                 
0x28 0x29 0x2a 0x2b 0x2c 0x2d 0x2e 0x2f 0x30 0x31                                 
0x32 0x33 0x34 0x35 0x36 0x37 0x38 0x39 0x3a 0x3b                                 
0x3c 0x3d 0x3e                                                                    
                                                                                  
wait 5 sec ...                                                                    
Waiting for data                                                                  
                                                                                  
Received:                                                                         
SNR  = 0                                                                          
RSSI = -75                                                                        
len  = 63                                                                         
0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09                                 
0x0a 0x0b 0x0c 0x0d 0x0e 0x0f 0x10 0x11 0x12 0x13                                 
0x14 0x15 0x16 0x17 0x18 0x19 0x1a 0x1b 0x1c 0x1d                                 
0x1e 0x1f 0x20 0x21 0x22 0x23 0x24 0x25 0x26 0x27                                 
0x28 0x29 0x2a 0x2b 0x2c 0x2d 0x2e 0x2f 0x30 0x31                                 
0x32 0x33 0x34 0x35 0x36 0x37 0x38 0x39 0x3a 0x3b                                 
0x3c 0x3d 0x3e                                                                    
                                                                                  
wait 5 sec ...                                                                    
Waiting for data                                                                  
                                                                                  
Received:                                                                         
SNR  = 0                                                                          
RSSI = -74                                                                        
len  = 63                                                                         
0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09                                 
0x0a 0x0b 0x0c 0x0d 0x0e 0x0f 0x10 0x11 0x12 0x13                                 
0x14 0x15 0x16 0x17 0x18 0x19 0x1a 0x1b 0x1c 0x1d                                 
0x1e 0x1f 0x20 0x21 0x22 0x23 0x24 0x25 0x26 0x27                                 
0x28 0x29 0x2a 0x2b 0x2c 0x2d 0x2e 0x2f 0x30 0x31                                 
0x32 0x33 0x34 0x35 0x36 0x37 0x38 0x39 0x3a 0x3b                                 
0x3c 0x3d 0x3e                                                                    
                                                                                  
wait 5 sec ...                                                                    
Waiting for data                                                                  
                                                                                  
Received:                                                                         
SNR  = 0                                                                          
RSSI = -76                                                                        
len  = 63                                                                         
0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09                                 
0x0a 0x0b 0x0c 0x0d 0x0e 0x0f 0x10 0x11 0x12 0x13                                 
0x14 0x15 0x16 0x17 0x18 0x19 0x1a 0x1b 0x1c 0x1d                                 
0x1e 0x1f 0x20 0x21 0x22 0x23 0x24 0x25 0x26 0x27                                 
0x28 0x29 0x2a 0x2b 0x2c 0x2d 0x2e 0x2f 0x30 0x31                                 
0x32 0x33 0x34 0x35 0x36 0x37 0x38 0x39 0x3a 0x3b                                 
0x3c 0x3d 0x3e

acassis · 2026-03-08T18:44:25Z

@cederom please dismiss the request change

arjav1528 · 2026-03-08T18:59:42Z

@arjav1528 I confirmed everything is working as expected:

Board 1:

*** Booting NuttX ***                                                        
I (19) boot: chip revision: v1.1                                             
I (19) boot.esp32: SPI Speed      : 40MHz                                    
I (19) boot.esp32: SPI Mode       : DIO                                      
I (20) boot.esp32: SPI Flash Size : 8MB                                      
I (24) boot: Enabling RNG early entropy source...                            
dram: lma 0x00001020 vma 0x3ffb2470 len 0x1bac   (7084)                      
iram: lma 0x00002bd4 vma 0x40080000 len 0x7db0   (32176)                     
padd: lma 0x0000a998 vma 0x00000000 len 0x5680   (22144)                     
imap: lma 0x00010020 vma 0x400d0020 len 0x15300  (86784)                     
padd: lma 0x00025328 vma 0x00000000 len 0xacf0   (44272)                     
dmap: lma 0x00030020 vma 0x3f400020 len 0x385c   (14428)                     
total segments stored 6                                                      
ABI (24) cpu_start: Pro cpu start user code                                       
I (24) cpu_start: cpu freq: 240000000 Hz                                          
I (24) spi_flash: detected chip: winbond                                          
I (26) spi_flash: flash io: dio                                                   
D__esp32_start: ESP32 chip revision is v1.1                                       
WARNING: NuttX supports ESP32 chip revision >= v3.0 (chip is v1.1).               
Ignoring this error and continuing because `ESP32_IGNORE_CHIP_REVISION_CHECK` is .
THIS MAY NOT WORK! DON'T USE THIS CHIP IN PRODUCTION!                             
                                                                                  
NuttShell (NSH) NuttX-12.12.0                                                     
nsh> ?                                                                            
help usage:  help [-v] [<cmd>]                                                    
                                                                                  
    .           cp          expr        mount       kill        uname             
    [           cmp         false       mv          pkill       umount            
    ?           dirname     fdinfo      pidof       sleep       unset             
    alias       df          free        printf      usleep      uptime            
    unalias     dmesg       help        ps          source      watch             
    basename    echo        hexdump     pwd         test        xd                
    break       env         ls          rm          time        wait              
    cat         exec        mkdir       rmdir       true                          
    cd          exit        mkrd        set         truncate                      
                                                                                  
Builtin Apps:                                                                     
    dd        nsh       sh        sx127x                                          
nsh> sx127x -m 1 -t                                                               
Start sx127x_demo                                                                 
FSK modulation                                                                    
Set frequency to 915000000                                                        
Set power to 20                                                                   
                                                                                  
Send 63 bytes                                                                     
wait 5 sec ...                                                                    
                                                                                  
Send 63 bytes                                                                     
wait 5 sec ...                                                                    
                                                                                  
Send 63 bytes                                                                     
wait 5 sec ...                                                                    
                                                                                  
Send 63 bytes                                                                     
wait 5 sec ...

Board 2:

*** Booting NuttX ***                                                        
I (19) boot: chip revision: v1.1                                             
I (19) boot.esp32: SPI Speed      : 40MHz                                    
I (19) boot.esp32: SPI Mode       : DIO                                      
I (20) boot.esp32: SPI Flash Size : 8MB                                      
I (24) boot: Enabling RNG early entropy source...                            
dram: lma 0x00001020 vma 0x3ffb2470 len 0x1bac   (7084)                      
iram: lma 0x00002bd4 vma 0x40080000 len 0x7db0   (32176)                     
padd: lma 0x0000a998 vma 0x00000000 len 0x5680   (22144)                     
imap: lma 0x00010020 vma 0x400d0020 len 0x15300  (86784)                     
padd: lma 0x00025328 vma 0x00000000 len 0xacf0   (44272)                     
dmap: lma 0x00030020 vma 0x3f400020 len 0x385c   (14428)                     
total segments stored 6                                                      
ABI (24) cpu_start: Pro cpu start user code                                       
I (24) cpu_start: cpu freq: 240000000 Hz                                          
I (24) spi_flash: detected chip: winbond                                          
I (26) spi_flash: flash io: dio                                                   
D__esp32_start: ESP32 chip revision is v1.1                                       
WARNING: NuttX supports ESP32 chip revision >= v3.0 (chip is v1.1).               
Ignoring this error and continuing because `ESP32_IGNORE_CHIP_REVISION_CHECK` is .
THIS MAY NOT WORK! DON'T USE THIS CHIP IN PRODUCTION!                             
                                                                                  
NuttShell (NSH) NuttX-12.12.0                                                     
nsh> uname -a                                                                     
NuttX 12.12.0 34928bdbed Mar  8 2026 15:40:30 xtensa heltec_wifi_lora32           
nsh> sx127x -m 1                                                                  
Start sx127x_demo                                                                 
FSK modulation                                                                    
Set frequency to 915000000                                                        
Set power to 20                                                                   
Waiting for data                                                                  
                                                                                  
Received:                                                                         
SNR  = 0                                                                          
RSSI = -74                                                                        
len  = 63                                                                         
0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09                                 
0x0a 0x0b 0x0c 0x0d 0x0e 0x0f 0x10 0x11 0x12 0x13                                 
0x14 0x15 0x16 0x17 0x18 0x19 0x1a 0x1b 0x1c 0x1d                                 
0x1e 0x1f 0x20 0x21 0x22 0x23 0x24 0x25 0x26 0x27                                 
0x28 0x29 0x2a 0x2b 0x2c 0x2d 0x2e 0x2f 0x30 0x31                                 
0x32 0x33 0x34 0x35 0x36 0x37 0x38 0x39 0x3a 0x3b                                 
0x3c 0x3d 0x3e                                                                    
                                                                                  
wait 5 sec ...                                                                    
Waiting for data                                                                  
                                                                                  
Received:                                                                         
SNR  = 0                                                                          
RSSI = -75                                                                        
len  = 63                                                                         
0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09                                 
0x0a 0x0b 0x0c 0x0d 0x0e 0x0f 0x10 0x11 0x12 0x13                                 
0x14 0x15 0x16 0x17 0x18 0x19 0x1a 0x1b 0x1c 0x1d                                 
0x1e 0x1f 0x20 0x21 0x22 0x23 0x24 0x25 0x26 0x27                                 
0x28 0x29 0x2a 0x2b 0x2c 0x2d 0x2e 0x2f 0x30 0x31                                 
0x32 0x33 0x34 0x35 0x36 0x37 0x38 0x39 0x3a 0x3b                                 
0x3c 0x3d 0x3e                                                                    
                                                                                  
wait 5 sec ...                                                                    
Waiting for data                                                                  
                                                                                  
Received:                                                                         
SNR  = 0                                                                          
RSSI = -74                                                                        
len  = 63                                                                         
0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09                                 
0x0a 0x0b 0x0c 0x0d 0x0e 0x0f 0x10 0x11 0x12 0x13                                 
0x14 0x15 0x16 0x17 0x18 0x19 0x1a 0x1b 0x1c 0x1d                                 
0x1e 0x1f 0x20 0x21 0x22 0x23 0x24 0x25 0x26 0x27                                 
0x28 0x29 0x2a 0x2b 0x2c 0x2d 0x2e 0x2f 0x30 0x31                                 
0x32 0x33 0x34 0x35 0x36 0x37 0x38 0x39 0x3a 0x3b                                 
0x3c 0x3d 0x3e                                                                    
                                                                                  
wait 5 sec ...                                                                    
Waiting for data                                                                  
                                                                                  
Received:                                                                         
SNR  = 0                                                                          
RSSI = -76                                                                        
len  = 63                                                                         
0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09                                 
0x0a 0x0b 0x0c 0x0d 0x0e 0x0f 0x10 0x11 0x12 0x13                                 
0x14 0x15 0x16 0x17 0x18 0x19 0x1a 0x1b 0x1c 0x1d                                 
0x1e 0x1f 0x20 0x21 0x22 0x23 0x24 0x25 0x26 0x27                                 
0x28 0x29 0x2a 0x2b 0x2c 0x2d 0x2e 0x2f 0x30 0x31                                 
0x32 0x33 0x34 0x35 0x36 0x37 0x38 0x39 0x3a 0x3b                                 
0x3c 0x3d 0x3e

damnn, nicee

cederom

Thank you @arjav1528 :-) Just came back from trip sorry for the delay :-)

acassis · 2026-03-08T19:09:16Z

Thank you @arjav1528 :-) Just came back from trip sorry for the delay :-)

No problem, don't worry!

github-actions bot added Area: Drivers Drivers issues Size: S The size of the change in this PR is small labels Mar 4, 2026

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arjav1528 requested a review from linguini1 March 5, 2026 13:43

arjav1528 dismissed stale reviews from jerpelea, acassis, and xiaoxiang781216 via 0c49eac March 5, 2026 15:33

arjav1528 force-pushed the dev-issue-17447 branch from b0bde89 to 0c49eac Compare March 5, 2026 15:33

github-actions bot added the Board: xtensa label Mar 5, 2026

arjav1528 requested a review from acassis March 5, 2026 16:06

cederom requested changes Mar 6, 2026

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arjav1528 added 2 commits March 7, 2026 03:48

wireless/lpwan/sx127x: Update default TX power and enable CRC

21faa91

Increase default TX power from 14 to 17 dBm and enable CRC by default to improve link reliability and data integrity. Signed-off-by: Arjav Patel <arjav1528@gmail.com>

docs/examples/sx127x_demo: Expand SX127X demo documentation

34928bd

Add default configuration, short-range FSK testing tips, and troubleshooting guidance for the SX127X demo example. Signed-off-by: Arjav Patel <arjav1528@gmail.com>

arjav1528 force-pushed the dev-issue-17447 branch from 0c49eac to 34928bd Compare March 6, 2026 22:21

github-actions bot removed the Board: xtensa label Mar 6, 2026

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cederom approved these changes Mar 8, 2026

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acassis merged commit 6f1edad into apache:master Mar 8, 2026
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arjav1528 commented Mar 4, 2026

Fixes: #17447

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