lireric / crc16

command line crc16 calculator

crc16

command line crc16 calculator

##using: crc16 <string_length>

##samples: #!/bin/bash

jsonFile='test/gsmcmd.json';
mcPort='/dev/ttyUSB0';

obj_dst=1;
obj_src=3;
message_type=2;

jsonValue=$(<$jsonFile)
len=${#jsonValue};

crc=$(./crc16 "$jsonValue" $len);

printf "===ssn1%04x%04x%02x%04x%s%04x\r" "$obj_dst" "$obj_src" "$message_type" "$len" "$jsonValue" "$crc" > $mcPort;

echo File transferred

or

#!/bin/bash

jsonFile='test/loadprefs.json';
mcPort='/dev/ttyUSB0';

obj_dst=1;
obj_src=3;
message_type=2;

jsonValue="{\"ssn\":{\"v\":1,\"obj\":1,\"cmd\":\"reboot\"}}";
len=${#jsonValue};

crc=$(./crc16 "$jsonValue" $len);

printf "===ssn1%04x%04x%02x%04x%s%04x\r" "$obj_dst" "$obj_src" "$message_type" "$len" "$jsonValue" "$crc" > $mcPort;

echo cmd reboot transferred