Persistent queue implementation for ESP32 stored in user specified partition in flash - when no space is available oldest elements are deleted until space is available

Maximum Queue element size is 255 bytes

file: queue.ino - test/play/exmaple
file: eeprom_queue.h - implementation

IMPORTANT: Before using please update :

#define EEPROM_Q_PARTIOTION_NAME "spiffs"
#define EEPROM_Q_PARTITION_SIZE (32 * 1024)

with the propriate values for you storage partition name and partions size in bytes

example partion table :

nvs, data, nvs, 0x9000, 0x4000,
phy_init, data, phy, 0xD000, 0x1000,
otadata, data, ota, 0xE000, 0x2000,
ota_0, app, ota_0, 0x10000, 1984K,
ota_1, app, ota_1, 0x200000, 1984K,
eeprom, data, 0x99, 0x3F0000, 0x1000,
nvs_key, data, nvs_keys,0x3F1000, 0x4000
spiffs, data, spiffs, 0x3F5000, 32K,
#12K not used

functions implemented :

inline void init_q() - call before everything else
inline void erase_q() - erase the whole partiotion
inline uint32_t get_q_count() - current count of elements in the queue
inline void get_q_first(uint8_t buf[], uint8_t & size) - read withot remove
inline void q_first_remove() - remove
inline void add_q_last(uint8_t buf[], uint8_t size) - add element - if no space delete from beggining until space is available

usage :

init_q
...
add_q_last
...
add_q_last
...
get_q_first
q_first_remove
...
get_q_first
q_first_remove

dependancy: Log64 lib ( if not required remove all lines with LOG64_XXXX )