Buffering MQTT messages (issue #14)

[PBrunot]

No description provided.

[github-actions]

Firmware size changes for esp32-devboard

Commit CURRENT 862c674 vs REFERENCE f22dcaa

<CURRENT> MAP file: ../firmware.map.latest
<REFERENCE> MAP file: ../firmware.map.previous
Difference is counted as <CURRENT> - <REFERENCE>,           i.e. a positive number means that <CURRENT> is larger.
Total sizes of <CURRENT>:                                       <REFERENCE>     Difference
Used static DRAM:   59004 bytes (  65576 remain, 47.4% used)          58940            +64 (    -64 remain,      +0 total)
      .data size:   26180 bytes                                       26180
      .bss  size:   32824 bytes                                       32760            +64
Used static IRAM:   85118 bytes (  45954 remain, 64.9% used)          85118                (     +0 remain,      +0 total)
      .text size:   84091 bytes                                       84091
   .vectors size:    1027 bytes                                        1027
Used Flash size : 1082179 bytes                                     1069659         +12520
           .text:  881979 bytes                                      870499         +11480
         .rodata:  199944 bytes                                      198904          +1040
Total image size: 1193477 bytes (.bin may be padded larger)         1180957         +12520

[github-actions]

Firmware size changes for hardware-rev0-it_IT

Commit CURRENT 862c674 vs REFERENCE f22dcaa

<CURRENT> MAP file: ../firmware.map.latest
<REFERENCE> MAP file: ../firmware.map.previous
Difference is counted as <CURRENT> - <REFERENCE>,           i.e. a positive number means that <CURRENT> is larger.
Total sizes of <CURRENT>:                                       <REFERENCE>     Difference
Used static IRAM:   66218 bytes ( 296022 remain, 18.3% used)          66218                (     +0 remain,      +0 total)
      .text size:   65191 bytes                                       65191
   .vectors size:    1027 bytes                                        1027
Used stat D/IRAM:   57393 bytes ( 288463 remain, 16.6% used)          57329            +64 (    -64 remain,      +0 total)
      .data size:   22433 bytes                                       22433
      .bss  size:   34960 bytes                                       34896            +64
Used Flash size : 1196523 bytes                                     1162171         +34352
           .text:  978883 bytes                                      947939         +30944
         .rodata:  217384 bytes                                      213976          +3408
Total image size: 1285174 bytes (.bin may be padded larger)         1250822         +34352