Messages Alignment

Alignment for uplink/datalink messages:

e.g. 32bits --> [ 8 ][ 16 ][ 24 ][ 32 ]

PAYLOAD = { [ char ][ uint16 ][ int8 ]

           [                    uint32                    ]
           [   uint8  ][ uint8[0] ][ uint8[1] ][ uint8[2] ]
           [ uint8[3] ][        int16         ][  length  ]
           [       uint16[](1)    ][       uint16[](2)    ]
           [       uint16[](3)    ]...