examples/xmlrpc: Fix calls buffers size.

[cederom]

Summary

• examples/xmlrpc/calls.c used 80 bytes call buffers.
• update buffers to CONFIG_XMLRPC_STRINGSIZE+1 that is build time configurable.
• this keeps buffers size coherent with configuration.
• updated internal variable names to pass lint checks.

Impact

• xmlrpc strings and buffers are now equal in size that prevents overflows.

Testing

Please help in runtime testing :-)

% uname -a
FreeBSD octagon 14.2-RELEASE-p1 FreeBSD 14.2-RELEASE-p1 GENERIC amd64

% ./tools/configure.sh -B esp32-devkitc:wifinsh

% gmake menuconfig <- enable apps / examples / xmlrpc.

% kconfig-diff
 BASE_DEFCONFIG "esp32-devkitc:wifinsh" -> "esp32-devkitc:wifinsh-dirty"
 EXAMPLES_XMLRPC n -> y
 NETUTILS_XMLRPC n -> y
+EXAMPLES_XMLRPC_BUFFERSIZE 1024
+XMLRPC_STRINGSIZE 64

% gmake -j8
Create version.h
Cloning Espressif HAL for 3rd Party Platforms
Clone: chip/esp-hal-3rdparty
Downloading: v1.7.12.tar.gz
Unpacking: v1.7.12.tar.gz -> cJSON
Register: xmlrpc
Register: renew
Register: nsh
Register: ping
Register: sh
Register: telnetd
Register: wapi
Espressif HAL for 3rd Party Platforms: e5cef265cca9d272c428d210453d574bcc25c5f4
Espressif HAL for 3rd Party Platforms: initializing submodules...
Applying patches...
CPP:  /XXX/nuttx.git/arch/xtensa/src/chip/esp-hal-3rdparty/components/esp_rom/esp32/ld/esp32.rom.newlib-funcs.ld-> /XXX/nuttx.git/arch/xtensa/src/chip/esp-hal-3rdparty/components/esp_rom/esp32/ld/esp32.rom.newlib-funcs.ld.tmpLD: nuttx
Memory region         Used Size  Region Size  %age Used
             ROM:      776692 B    4194272 B     18.52%
     iram0_0_seg:      128812 B       168 KB     74.88%
     irom0_0_seg:      580084 B    3342304 B     17.36%
     dram0_0_seg:       73064 B     180736 B     40.43%
     drom0_0_seg:      139276 B    4194272 B      3.32%
    rtc_iram_seg:          0 GB         8 KB      0.00%
    rtc_slow_seg:          0 GB         4 KB      0.00%
      extmem_seg:          0 GB         4 MB      0.00%
CP: nuttx.hex
MKIMAGE: ESP32 binary
esptool.py -c esp32 elf2image --ram-only-header -fs 4MB -fm dio -ff 40m -o nuttx.bin nuttx
esptool.py v4.8.1
Creating esp32 image...
Image has only RAM segments visible. ROM segments are hidden and SHA256 digest is not appended.
Merged 1 ELF section
Successfully created esp32 image.
Generated: nuttx.bin

[cederom]

Formatting issues, sorry, will fix after a short sleep mode (6AM here) :-)

[acassis]

@acassis: Please fix coding style issues

Done :-)

Mixed case identifiers were here before and seem to be part of XMLRPC implementation? See https://xmlrpc-c.sourceforge.io/doc/libxmlrpc_client++.html. These are internal variables so we can change them with no impact I guess :-)

[acassis]

@cederom suggestion: lastCommand -> lastcmd; curState -> curstate

[cederom]

Variables updated: lastCommand -> lastcmd; curState -> curstate :-)

% gmake -j8
Create version.h
Downloading: v1.7.12.tar.gz
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0Cloning Espressif HAL for 3rd Party Platforms
Clone: chip/esp-hal-3rdparty LN: platform/board to /XXX/nuttx-apps.git/platform/dummy
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
100  340k  100  340k    0     0   473k      0 --:--:-- --:--:-- --:--:--  473k
Unpacking: v1.7.12.tar.gz -> cJSON
Register: xmlrpc
Register: renew
Register: ping
Register: nsh
Register: sh
Register: telnetd
Register: wapi
Espressif HAL for 3rd Party Platforms: e5cef265cca9d272c428d210453d574bcc25c5f4
Espressif HAL for 3rd Party Platforms: initializing submodules...
Applying patches...
(..)
Memory region         Used Size  Region Size  %age Used
             ROM:      776692 B    4194272 B     18.52%
     iram0_0_seg:      128812 B       168 KB     74.88%
     irom0_0_seg:      580084 B    3342304 B     17.36%
     dram0_0_seg:       73064 B     180736 B     40.43%
     drom0_0_seg:      139276 B    4194272 B      3.32%
    rtc_iram_seg:          0 GB         8 KB      0.00%
    rtc_slow_seg:          0 GB         4 KB      0.00%
      extmem_seg:          0 GB         4 MB      0.00%
CP: nuttx.hex
MKIMAGE: ESP32 binary
esptool.py -c esp32 elf2image --ram-only-header -fs 4MB -fm dio -ff 40m -o nuttx.bin nuttx
esptool.py v4.8.1
Creating esp32 image...
Image has only RAM segments visible. ROM segments are hidden and SHA256 digest is not appended.
Merged 1 ELF section
Successfully created esp32 image.
Generated: nuttx.bin