Problem

NECTA’s Snakky will call VendSuccess on MDB for cash sales

Story

This is about NECTA Snakky again. first one

Apparently NECTA’s Snakky firmware developers are not reading MDB protocol carefully.

VendSuccess 0x13 0x02 is for cashless only, and it’s for cashless devices to acknoledge the payment. To report a cash sales, just use the CashSale 0x13 0x05.

Solution

Ignore the VendSuccess 0x13 0x12 instruction.