Min Free Heap drop over time (

[andrevipid]

Hello I have used esp32 connecting to multiple BLE Sensors (servers). In addition to that I have a buffer where I add measreuments from sensors and when it reachs maximum readings for the period (like every 1 minute) it activate a task that send the data to AWS via MQTT.

It runs free of cpu load, very smoothly, however after couple of minutes it starts dropping the min_free_heap over time:

Green: Free heap
Yellow: Min free heap

After dropping overtime it reachs low memory, an error like that appears:

2025-01-08 10:24:53 --> CORRUPT HEAP: Bad head at 0x3ffdfb30. Expected 0xabba1234 got 0x3ffcb4bc
2025-01-08 10:24:53 -->
2025-01-08 10:24:53 --> assert failed: multi_heap_free multi_heap_poisoning.c:279 (head != NULL)
2025-01-08 10:24:53 -->
2025-01-08 10:24:53 -->
2025-01-08 10:24:53 --> Backtrace: 0x4008253d:0x3ffd3430 0x400943a9:0x3ffd3450 0x4009a7c6:0x3ffd3470 0x400994cf:0x3ffd35a0 0x4008354f:0x3ffd35c0 0x4009a7f9:0x3ffd35e0 0x401745fd:0x3ffd3600 0x40173605:0x3ffd3620 0x400d5183:0x3ffd3640 0x400d7215:0x3ffd3660 0x400d7279:0x3ffd3690 0x400d29bd:0x3ffd36b0 0x400d5b2b:0x3ffd3700 0x400db909:0x3ffd3760 0x400dc5d2:0x3ffd3780 0x400dc5f8:0x3ffd37e0 0x400e0baa:0x3ffd3840 0x400e0ddd:0x3ffd3860 0x400dfa39:0x3ffd3880 0x40081341:0x3ffd38a0 0x400d606f:0x3ffd38c0 0x400954a6:0x3ffd38e0

I do not want to modify my code to track that on ESP IDF because I am using nimBLE library and do not want to modify deeper what is used for arduino firmware on esp32.

Is there anyway to fix that or better investigate ? I am just able to see tasks allocation and task execution time and all seems okay:

2025-01-13 19:56:15 --> ---- Heap Statistics ----
2025-01-13 19:56:15 --> Free Heap: 65248 bytes
2025-01-13 19:56:15 --> Minimum Free Heap: 18600 bytes
2025-01-13 19:56:15 --> free block maximum/biggest: 59380 bytes
2025-01-13 19:56:15 --> free blocks: 18
2025-01-13 19:56:15 --> allocation: 426
2025-01-13 19:56:15 --> total free memory: 65248 bytes
2025-01-13 19:56:15 --> total allocated memory: 174744 bytes

2025-01-13 19:56:15 --> ---- Tasks List ----
2025-01-13 19:56:15 --> Task Name.State.Priority.Stack.Task#
2025-01-13 19:56:15 --> loopTask .X.1.4940.8.1
2025-01-13 19:56:15 --> IDLE1 .R.0.580.6.1
2025-01-13 19:56:15 --> IDLE0 .R.0.464.5.0
2025-01-13 19:56:15 --> Tmr Svc .B.1.3384.7.-1
2025-01-13 19:56:15 --> Performance Tas.B.1.1612.17.-1
2025-01-13 19:56:15 --> MQTT Task .B.1.3564.16.1
2025-01-13 19:56:15 --> tiT .B.18.2992.12.0
2025-01-13 19:56:15 --> ipc1 .S.24.476.2.1
2025-01-13 19:56:15 --> ipc0 .S.1.332.1.0
2025-01-13 19:56:15 --> nimble_host .B.21.1904.11.0
2025-01-13 19:56:15 --> wifi .B.23.4340.15.0
2025-01-13 19:56:15 --> esp_timer .S.22.7824.3.0
2025-01-13 19:56:15 --> btController .B.23.2092.10.0
2025-01-13 19:56:15 --> sys_evt .B.20.2940.13.0
2025-01-13 19:56:15 --> arduino_events .B.19.2368.14.1

2025-01-13 19:56:15 --> ---- Task Execution time ----
2025-01-13 19:56:15 --> Task Name.Runtime.Percentage
2025-01-13 19:56:15 --> loopTask .12158103..<1%
2025-01-13 19:56:15 --> IDLE1 .1395156752..99%
2025-01-13 19:56:15 --> IDLE0 .1236219156..87%
2025-01-13 19:56:15 --> Tmr Svc .498326..<1%
2025-01-13 19:56:15 --> Performance Tas.198104..<1%
2025-01-13 19:56:15 --> MQTT Task .807600..<1%
2025-01-13 19:56:15 --> tiT .5976641..<1%
2025-01-13 19:56:15 --> ipc0 .217193..<1%
2025-01-13 19:56:15 --> nimble_host .15268041..1%
2025-01-13 19:56:15 --> sys_evt .1815..<1%
2025-01-13 19:56:15 --> btController .51594465..3%
2025-01-13 19:56:15 --> wifi .83647874..5%
2025-01-13 19:56:15 --> esp_timer .15099853..1%
2025-01-13 19:56:15 --> arduino_events .1132..<1%
2025-01-13 19:56:15 --> ipc1 .49617..<1%