Checksumming and USB port searching works

go.sum

@@ -1,3 +1,5 @@
+github.com/akamensky/argparse v1.3.1 h1:kP6+OyvR0fuBH6UhbE6yh/nskrDEIQgEA1SUXDPjx4g=
+github.com/akamensky/argparse v1.3.1/go.mod h1:S5kwC7IuDcEr5VeXtGPRVZ5o/FdhcMlQz4IZQuw64xA=
 github.com/albenik/go-serial v1.2.0 h1:VhEIWqP5tbWtsWoCjeBHHQEf6qeXpsJXvZBP9px5F84=
 github.com/albenik/go-serial v1.2.0/go.mod h1:9NHUOwCBJER+lAaitTWLJda/GnYoP4Vga7KU3vn1lmM=
 github.com/creack/goselect v0.1.0 h1:4QiXIhcpSQF50XGaBsFzesjwX/1qOY5bOveQPmN9CXY=
@@ -7,6 +9,12 @@ github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/sigurn/crc16 v0.0.0-20211026045750-20ab5afb07e3 h1:aQKxg3+2p+IFXXg97McgDGT5zcMrQoi0EICZs8Pgchs=
+github.com/sigurn/crc16 v0.0.0-20211026045750-20ab5afb07e3/go.mod h1:9/etS5gpQq9BJsJMWg1wpLbfuSnkm8dPF6FdW2JXVhA=
+github.com/sigurn/crc8 v0.0.0-20160107002456-e55481d6f45c h1:hk0Jigjfq59yDMgd6bzi22Das5tyxU0CtOkh7a9io84=
+github.com/sigurn/crc8 v0.0.0-20160107002456-e55481d6f45c/go.mod h1:cyrWuItcOVIGX6fBZ/G00z4ykprWM7hH58fSavNkjRg=
+github.com/sigurn/utils v0.0.0-20190728110027-e1fefb11a144 h1:ccb8W1+mYuZvlpn/mJUMAbsFHTMCpcJBS78AsBQxNcY=
+github.com/sigurn/utils v0.0.0-20190728110027-e1fefb11a144/go.mod h1:VRI4lXkrUH5Cygl6mbG1BRUfMMoT2o8BkrtBDUAm+GU=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.3.0 h1:TivCn/peBQ7UY8ooIcPgZFpTNSz0Q2U6UrFlUfqbe0Q=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=