See github thread sendwithmessage for Smileycoin
Can send messages by coding it into the blockchain
smileycoin-cli sendwithmessage BEtZyyYqDXqmRJJ45nnL15cuASfiXg9Yik 1000 "Hello, Betzyy"
See transaction daf75d1ae31877b51856b4dee931600a5a5db819f52a5d98627f8a070a72b723:
Note how the coding uses ASCII characters 32-128 (0x20-0x7F), requiring 2 bytes per character, see http://www.asciitable.com/ (subtracting 32 dec from each ASCII code)