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@OpenCL: ustaw komunikację w tryb HEX, albo UCS2 i potem już z górki, możesz wysyłać dowolne bajty.

AT+CSCS="UCS2"

16-bit universal multiple-octet coded character set (ISO/IEC10646); UCS2 character strings are converted to hexadecimal numbers from 0000 to FFFF; e.g. "004100620063" equals three 16-bit characters with decimal values 65, 98 and 99


AT+CSCS="HEX"

"HEX" Character strings consist only of hexadecimal numbers from 00 to FF;


https://www.elecrow.com/wiki/images/2/20/SIM800_Series_AT_Command_Manual_V1.09.pdf