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00_HMUARTLGW.pm: check if LastSendLen is defined before using it

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git-svn-id: https://svn.fhem.de/fhem/trunk@14899 2b470e98-0d58-463d-a4d8-8e2adae1ed80
This commit is contained in:
mgernoth 2017-08-14 16:49:04 +00:00
parent 1a32894b59
commit 72fbadc428
1 changed files with 2 additions and 1 deletions
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fhem/FHEM/00_HMUARTLGW.pm
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@ -1459,7 +1459,8 @@ sub HMUARTLGW_Read($)
my $crc = HMUARTLGW_crc16(chr(0xfd).$unescaped);
if ($crc != 0x0000 &&
$hash->{DevState} != HMUARTLGW_STATE_RUNNING) {
$hash->{DevState} != HMUARTLGW_STATE_RUNNING &&
defined($hash->{Helper}{LastSendLen})) {
#When writing to the device while it prepares to write a frame to
#the host, the device seems to initialize the crc with 0x827f or
#0x8281 plus the length of the frame being received (firmware bug).