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From Wiki Knowledge Base | Teltonika GPS

Numerical value describes start offset and is an optional field. Numerical value of 20 means that blackbox data is requested starting from 20th latest event. When # is omitted the latest events are packed to single SMS.
X1:Y1,X2:Y2,…,Xn:Yn, where Xn – HEX value of event ID. Yn – HEX value of custom data field (optional).