fix(print): Fix format specifiers

[lucasssvaz]

Description of Change

This pull request standardizes the usage of format specifiers in Serial.printf calls across multiple example files, replacing %d and %u with %zu (for size_t values) and %lu (for unsigned long values). This improves type safety and ensures correct output formatting, especially on platforms where size_t and related types may differ in size from int or unsigned int.

Serial output formatting improvements:

• Replaced %d and %u with %zu in Serial.printf statements for variables of type size_t in UDP, Bluetooth, BLE, and Serial examples, ensuring proper formatting for buffer sizes, data lengths, and counts. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] [21] [22] [23]
• Updated %ld to %lu in Serial.printf for unsigned long variables, such as delay times, to match the variable type in deep sleep and progress reporting examples. [1] [2]

These changes help prevent formatting errors and potential undefined behavior, making the code more robust and portable across platforms.

[github-actions]

Warnings

⚠️

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[github-actions]

Memory usage test (comparing PR against master branch)

The table below shows the summary of memory usage change (decrease - increase) in bytes and percentage for each target.

Memory	FLASH [bytes]		FLASH [%]		RAM [bytes]		RAM [%]
Target	DEC	INC	DEC	INC	DEC	INC	DEC	INC
ESP32C5	0	0	0.00	0.00	0	0	0.00	0.00
ESP32P4	0	0	0.00	0.00	0	0	0.00	0.00
ESP32S3	0	0	0.00	0.00	0	0	0.00	0.00
ESP32S2	0	0	0.00	0.00	0	0	0.00	0.00
ESP32C3	💚 -32	0	💚 -0.01	0.00	0	0	0.00	0.00
ESP32C6	0	0	0.00	0.00	0	0	0.00	0.00
ESP32H2	0	0	0.00	0.00	0	0	0.00	0.00
ESP32	0	⚠️ +32	0.00	⚠️ +0.01	0	0	0.00	0.00

Click to expand the detailed deltas report [usage change in BYTES]

Target	ESP32C5		ESP32P4		ESP32S3		ESP32S2		ESP32C3		ESP32C6		ESP32H2		ESP32
Example	FLASH	RAM	FLASH	RAM	FLASH	RAM	FLASH	RAM	FLASH	RAM	FLASH	RAM	FLASH	RAM	FLASH	RAM
libraries/AsyncUDP/examples/AsyncUDPClient	-	-	0	0	0	0	0	0	0	0	0	0	-	-	0	0
libraries/AsyncUDP/examples/AsyncUDPMulticastServer	-	-	0	0	0	0	0	0	0	0	-	-	-	-	⚠️ +16	0
libraries/AsyncUDP/examples/AsyncUDPServer	-	-	0	0	0	0	0	0	0	0	-	-	-	-	0	0
libraries/BLE/examples/Beacon_Scanner	-	-	0	0	-	-	-	-	0	0	-	-	0	0	0	0
libraries/ESP32/examples/ArduinoStackSize	-	-	0	0	-	-	0	0	0	0	-	-	0	0	⚠️ +32	0
libraries/ESP32/examples/RMT/RMTLoopback	-	-	0	0	-	-	0	0	0	0	-	-	0	0	0	0
libraries/ESP32/examples/Serial/OnReceiveError_BREAK_Demo	-	-	0	0	-	-	0	0	0	0	-	-	0	0	⚠️ +16	0
libraries/ESP32/examples/Serial/OnReceive_Demo	-	-	0	0	-	-	0	0	0	0	-	-	0	0	⚠️ +16	0
libraries/ESP32/examples/Serial/RxFIFOFull_Demo	-	-	0	0	-	-	0	0	0	0	-	-	0	0	0	0
libraries/ESP32/examples/Serial/RxTimeout_Demo	-	-	0	0	-	-	0	0	0	0	-	-	0	0	0	0
libraries/ESP32/examples/Serial/Serial_STD_Func_OnReceive	-	-	0	0	-	-	0	0	0	0	-	-	0	0	0	0
libraries/FFat/examples/FFat_Test	-	-	0	0	-	-	0	0	0	0	-	-	0	0	0	0
libraries/HTTPUpdateServer/examples/WebUpdater	-	-	0	0	-	-	0	0	0	0	-	-	-	-	0	0
libraries/LittleFS/examples/LITTLEFS_test	-	-	0	0	-	-	0	0	0	0	-	-	0	0	0	0
libraries/SD/examples/SD_Test	-	-	0	0	-	-	0	0	💚 -32	0	-	-	0	0	0	0
libraries/SPIFFS/examples/SPIFFS_Test	-	-	0	0	-	-	0	0	0	0	-	-	0	0	⚠️ +16	0
libraries/Update/examples/HTTP_Client_AES_OTA_Update	-	-	0	0	-	-	0	0	0	0	-	-	-	-	⚠️ +16	0
libraries/Update/examples/HTTP_Server_AES_OTA_Update	-	-	0	0	-	-	0	0	0	0	-	-	-	-	0	0
libraries/Update/examples/OTAWebUpdater	-	-	0	0	-	-	0	0	0	0	-	-	-	-	0	0
libraries/Update/examples/Signed_OTA_Update	-	-	0	0	-	-	0	0	0	0	-	-	-	-	0	0
libraries/WebServer/examples/WebUpdate	-	-	0	0	-	-	0	0	0	0	-	-	-	-	0	0
libraries/SD_MMC/examples/SDMMC_Test	-	-	0	0	-	-	-	-	-	-	-	-	-	-	0	0
libraries/BluetoothSerial/examples/DiscoverConnect	-	-	-	-	-	-	-	-	-	-	-	-	-	-	0	0
libraries/ESP32/examples/DeepSleep/SmoothBlink_ULP_Code	-	-	-	-	-	-	-	-	-	-	-	-	-	-	0	0

[github-actions]

Test Results

 90 files   90 suites   33m 9s ⏱️
 66 tests  66 ✅ 0 💤 0 ❌
675 runs  675 ✅ 0 💤 0 ❌

Results for commit d0c8651.

♻️ This comment has been updated with latest results.

[Copilot]

Pull request overview

This pull request standardizes format specifiers in Serial.printf calls across multiple example files to improve type safety. The changes replace incorrect format specifiers (%d, %u, %ld) with the appropriate ones (%zu for size_t, %lu for unsigned long) to ensure correct output formatting and prevent potential undefined behavior across different platforms.

Key changes:

• Updated format specifiers from %d/%u to %zu for size_t variables (buffer sizes, data lengths, counts)
• Updated format specifiers from %ld to %lu for unsigned long variables (delay times, timestamps)

Reviewed changes

Copilot reviewed 24 out of 24 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
libraries/WebServer/examples/WebUpdate/WebUpdate.ino	Changed format specifier for upload.totalSize from %u to %zu
libraries/Update/examples/Signed_OTA_Update/Signed_OTA_Update.ino	Changed format specifiers for firmwareSize, signatureSize, and written from %d to %zu
libraries/Update/examples/OTAWebUpdater/OTAWebUpdater.ino	Changed format specifiers for fsize and upload.totalSize from %d/%u to %zu
libraries/Update/examples/HTTP_Server_AES_OTA_Update/HTTP_Server_AES_OTA_Update.ino	Changed format specifiers for progress percentage and upload.totalSize from %d/%u to %zu
libraries/Update/examples/HTTP_Client_AES_OTA_Update/HTTP_Client_AES_OTA_Update.ino	Changed format specifier for progress percentage from %d to %zu
libraries/SPIFFS/examples/SPIFFS_Test/SPIFFS_Test.ino	Changed format specifier for flen from %u to %zu
libraries/SD_MMC/examples/SDMMC_Test/SDMMC_Test.ino	Changed format specifier for flen from %u to %zu
libraries/SD/examples/SD_Test/SD_Test.ino	Changed format specifier for flen from %u to %zu
libraries/LittleFS/examples/LITTLEFS_test/LITTLEFS_test.ino	Changed format specifier for flen from %u to %zu
libraries/HTTPUpdateServer/src/HTTPUpdateServer.h	Changed format specifier for upload.totalSize from %u to %zu
libraries/FFat/examples/FFat_Test/FFat_Test.ino	Changed format specifiers for flen, totalBytes(), and freeBytes() from %u to %zu
libraries/ESP32/examples/Serial/Serial_STD_Func_OnReceive/Serial_STD_Func_OnReceive.ino	Changed format specifier for len from %d to %zu
libraries/ESP32/examples/Serial/RxTimeout_Demo/RxTimeout_Demo.ino	Changed format specifier for sentBytes from %d to %zu
libraries/ESP32/examples/Serial/RxFIFOFull_Demo/RxFIFOFull_Demo.ino	Changed format specifier for sentBytes from %d to %zu
libraries/ESP32/examples/Serial/OnReceive_Demo/OnReceive_Demo.ino	Changed format specifiers for available, sent_bytes, and received_bytes from %d to %zu
libraries/ESP32/examples/Serial/OnReceiveError_BREAK_Demo/OnReceiveError_BREAK_Demo.ino	Changed format specifiers for available, sent_bytes, and received_bytes from %d to %zu
libraries/ESP32/examples/RMT/RMTLoopback/RMTLoopback.ino	Changed format specifier for rx_num_symbols from %d to %zu
libraries/ESP32/examples/DeepSleep/SmoothBlink_ULP_Code/SmoothBlink_ULP_Code.ino	Changed format specifier for fadeCycleDelay from %ld to %lu
libraries/ESP32/examples/ArduinoStackSize/ArduinoStackSize.ino	Changed format specifiers for getArduinoLoopTaskStackSize() and uxTaskGetStackHighWaterMark() from %d to %zu
libraries/BluetoothSerial/examples/DiscoverConnect/DiscoverConnect.ino	Changed format specifier for channels.size() from %d to %zu
libraries/BLE/examples/Beacon_Scanner/Beacon_Scanner.ino	Changed format specifiers for dataLength from %d to %zu
libraries/AsyncUDP/examples/AsyncUDPServer/AsyncUDPServer.ino	Changed format specifier for packet.length() from %u to %zu
libraries/AsyncUDP/examples/AsyncUDPMulticastServer/AsyncUDPMulticastServer.ino	Changed format specifier for packet.length() from %u to %zu
libraries/AsyncUDP/examples/AsyncUDPClient/AsyncUDPClient.ino	Changed format specifier for packet.length() from %u to %zu

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