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Serial communication between ESP-01 and UNO

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When sending a limited amount of data from ESP to UNO I am reeiwing someting like that.

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SDK:2.2.2-dev(38a443e)/Core:3.1.2=30102000/lwIP:STABLE-2_1_3_RELEASE/glue:1.2-65-g06164fb/BearSSL:b024386

UnoSerial is listening!

UnoSerial is listening!

--------------- CUT HERE FOR EXCEPTION DECODER ---------------

Soft WDT reset

Exception (4):
epc1=0x402010e8 epc2=0x00000000 epc3=0x00000000 excvaddr=0x00000000 depc=0x00000000

>>>stack>>>

ctx: cont
sp: 3ffffe40 end: 3fffffd0 offset: 0160
**3fffffa0: 3fffdad0 00000000 00000002 3ffee6b0 **
**3fffffb0: 3fffdad0 00000000 3ffee684 40201f34 **
**3fffffc0: feefeffe feefeffe 3fffdab0 401010cd **
<<<stack<<<

--------------- CUT HERE FOR EXCEPTION DECODER ---------------

Any idea?
Thank you

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