updates to handler
This commit is contained in:
Magnus Lundmark
parent
fb4cef7085
commit
1795d2f3c0
@ -31,7 +31,7 @@ def np2bin(npbin):
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def df(msg):
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"""Decode Downlink Format vaule, bits 1 to 5."""
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msgbin = hex2bin(msg)
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return bin2int(msgbin[0:5])
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return min( bin2int(msgbin[0:5]) , 24 )
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def crc(msg, encode=False):
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@ -146,64 +146,84 @@ class BaseClient(Thread):
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def read_skysense_buffer(self):
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"""
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----------------------------------------------------------------------------------
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Field SS MS MS MS MS MS MS MS MS MS MS MS MS MS MS TS TS TS TS TS TS RS RS RS
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----------------------------------------------------------------------------------
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Position: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
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----------------------------------------------------------------------------------
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Example: 24 8d 4c a5 c0 20 24 22 f1 28 38 20 f3 24 04 be 8d 0d d8 e0 80 66 ed b9
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Example: 24 5d 3c 48 c8 ad 3d f9 00 00 00 00 00 00 00 be 8d 66 c4 c5 7c 4c d7 2d
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SS field - Start character
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Position 0:
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1 byte = 8 bits
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Start character '$'
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MS field - Payload
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Postion 1 through 14:
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14 bytes = 112 bits
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Mode-S payload
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In case of DF types that only carry 7 bytes of information position 8 through 14 are set to 0x00.
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Decoding of payload information is not within the scope of this document.
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TS field - Time stamp
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Position 15 through 20:
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6 bytes = 48 bits
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Time stamp with fields as:
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Lock Status - Status of internal time keeping mechanism
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Equal to 1 if operating normally
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Bit 47 - 1 bit
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Time of day in UTC seconds, between 0 and 86399
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Bits 46 through 30 - 17 bits
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Nanoseconds into current second, between 0 and 999999999
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Bits 29 through 0 - 30 bits
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RS field - Signal Level
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Position 21 through 23:
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3 bytes = 24 bits
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RSSI (received signal strength indication) and relative noise level with fields
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RNL, Q12.4 unsigned fixed point binary with 4 fractional bits and 8 integer bits.
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This is and indication of the noise level of the message. Roughly 40 counts per 10dBm.
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Bits 23 through 12 - 12 bits
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RSSI, Q12.4 unsigned fixed point binary with 4 fractional bits and 8 integer bits.
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This is an indication of the signal level of the received message in ADC counts. Roughly 40 counts per 10dBm.
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Bits 11 through 0 - 12 bits
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"""
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SS_MSGLENGTH = 24
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----------------------------------------------------------------------------------
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Field SS MS MS MS MS MS MS MS MS MS MS MS MS MS MS TS TS TS TS TS TS RS RS RS
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----------------------------------------------------------------------------------
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Position: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
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----------------------------------------------------------------------------------
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Example: 24 8d 4c a5 c0 20 24 22 f1 28 38 20 f3 24 04 be 8d 0d d8 e0 80 66 ed b9
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Example: 24 5d 3c 48 c8 ad 3d f9 00 00 00 00 00 00 00 be 8d 66 c4 c5 7c 4c d7 2d
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SS field - Start character
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Position 0:
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1 byte = 8 bits
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Start character '$'
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MS field - Payload
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Postion 1 through 14:
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14 bytes = 112 bits
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Mode-S payload
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In case of DF types that only carry 7 bytes of information position 8 through 14 are set to 0x00.
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Decoding of payload information is not within the scope of this document.
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TS field - Time stamp
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Position 15 through 20:
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6 bytes = 48 bits
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Time stamp with fields as:
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Lock Status - Status of internal time keeping mechanism
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Equal to 1 if operating normally
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Bit 47 - 1 bit
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Time of day in UTC seconds, between 0 and 86399
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Bits 46 through 30 - 17 bits
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Nanoseconds into current second, between 0 and 999999999
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Bits 29 through 0 - 30 bits
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RS field - Signal Level
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Position 21 through 23:
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3 bytes = 24 bits
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RSSI (received signal strength indication) and relative noise level with fields
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RNL, Q12.4 unsigned fixed point binary with 4 fractional bits and 8 integer bits.
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This is and indication of the noise level of the message. Roughly 40 counts per 10dBm.
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Bits 23 through 12 - 12 bits
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RSSI, Q12.4 unsigned fixed point binary with 4 fractional bits and 8 integer bits.
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This is an indication of the signal level of the received message in ADC counts. Roughly 40 counts per 10dBm.
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Bits 11 through 0 - 12 bits
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"""
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SS_STARTCHAR = 0x24
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messages = []
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msg = []
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i = 0
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while i < len(self.buffer):
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if self.buffer[i] == 0x24:
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if self.buffer[i] == SS_STARTCHAR:
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i += 1
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if (self.buffer[i]>>7):
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#Long message
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payload = self.buffer[i:i+14]
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else:
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#Short message
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payload = self.buffer[i:i+7]
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msg = ''.join('%02X' % i for i in payload)
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i += 14
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tsbin = self.buffer[i:i+6]
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sec = (tsbin[0] << 10) | (tsbin[1] << 2) | (tsbin[2] >> 6)
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nano = (tsbin[2] << 24) | (tsbin[3] << 16) | (tsbin[4] << 8) | tsbin[5]
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ts = sec + nano*1.0e-9
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i += 6
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#Signal level - Don't care
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i += 3
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messages.append( [msg,ts] )
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