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fix Hytera SMS decode

This commit is contained in:
KF7EEL 2022-03-02 13:37:00 -08:00
parent f661a50098
commit e784c033e1
1 changed files with 9 additions and 2 deletions
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11
data_gateway.py
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@ -1411,9 +1411,11 @@ def data_received(self, _peer_id, _rf_src, _dst_id, _seq, _slot, _call_type, _fr
if _dtype_vseq == 6 or _dtype_vseq == 'group':
global btf, hdr_start
# Header is a "Defined Short Data", used by Hytera I suspect
if ahex(bptc_decode(_data)[:-88]) == b'0d':
if ahex(bptc_decode(_data)[4:-88]) == b'd0':
logger.debug('Defined Short Data header detected.')
btf = (ba2num(bptc_decode(_data)[12:-80]))
# Construct blocks to follow
btf = (ba2num(bptc_decode(_data)[2:-92] + bptc_decode(_data)[12:-80]))
hdr_type = 'dsd'
# Everyone else
else:
logger.debug('Unconfirmed Data header detected.')
@ -1422,6 +1424,7 @@ def data_received(self, _peer_id, _rf_src, _dst_id, _seq, _slot, _call_type, _fr
logger.debug(ahex(bptc_decode(_data)))
logger.info('Blocks to follow: ' + str(ba2num(bptc_decode(_data)[65:72])))
btf = ba2num(bptc_decode(_data)[65:72])
hdr_type = ''
# Try resetting packet_assembly
packet_assembly = ''
# Data blocks at 1/2 rate, see https://github.com/g4klx/MMDVM/blob/master/DMRDefines.h for data types. _dtype_seq defined here also
@ -1445,6 +1448,10 @@ def data_received(self, _peer_id, _rf_src, _dst_id, _seq, _slot, _call_type, _fr
final_packet = str(bitarray(re.sub("\)|\(|bitarray|'", '', packet_assembly)).tobytes().decode('utf-8', 'ignore'))
sms_hex = str(ba2hx(bitarray(re.sub("\)|\(|bitarray|'", '', packet_assembly))))
sms_hex_string = re.sub("b'|'", '', str(sms_hex))
if hdr_type == 'dsd':
logger.debug('Trimmed for Defined Short Data')
print(hdr_type)
sms_hex_string = sms_hex_string[2:]
# Filter out ARS
# Look for port 4005 twice, and 'hello' - 000cf0, and UDP header in first 16 characters
## if sms_hex_string[40:48] == '0fa50fa5':