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I always get false when I get it with getBitAt

I'm now using "readArea" method to read DBs of S7-300, but I found the number of DB (12 vars per DB) is too much, so the efficient is too lower. And now I found "readMultiVars" method, whether I can use "readMultiVars" method to read multi DBs once communication to increase the efficient? Thank you and waiting for your response.

private final byte[] pdu = new byte[2048]

限制了读取的长度

hi i have one problem with writeBit() and writeByte() methods!
in writeBit method, you first set value in bitPos'th position of first byte(buffer[0]) and in continue write buffer in ((start * 8) + bitPos) of area. this causes this method write always 0 for me!
I changed the method as follows to work correctly:
default boolean writeBit(AreaType area, int db, int start, int bitPos, boolean value) throws S7Exception {
// reset first byte?
// S7.setByteAt(buffer, 0, (byte) 0x00);
// S7.setBitAt(buffer, 0, bitPos, value);
S7.setBitAt(buffer, (start * 8) + bitPos, bitPos, value);
return writeArea(area, db, (start * 8) + bitPos, 1, DataType.BIT, buffer);
}
and similarly in writeByte method.