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multibyte trace support

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Florent 2026-02-26 22:51:52 -04:00
parent 32907bb5c1
commit dd6d6350d9
2 changed files with 63 additions and 41 deletions
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32
src/meshcore/reader.py
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@ -532,10 +532,14 @@ class MessageReader:
# According to the source, format is:
# 0x89, reserved(0), path_len, flags, tag(4), auth(4), path_hashes[], path_snrs[], final_snr
path_len = data[2]
flags = data[3]
tag = int.from_bytes(data[4:8], byteorder="little")
auth_code = int.from_bytes(data[8:12], byteorder="little")
reserved = dbuf.read(1)[0]
path_len = dbuf.read(1)[0]
flags = dbuf.read(1)[0]
tag = int.from_bytes(dbuf.read(4), byteorder="little")
auth_code = int.from_bytes(dbuf.read(4), byteorder="little")
path_hash_len = 1 << (flags&3)
path_len = int(path_len / path_hash_len)
# Initialize result
res["tag"] = tag
@ -546,26 +550,20 @@ class MessageReader:
# Process path as array of objects with hash and SNR
path_nodes = []
if path_len > 0 and len(data) >= 12 + path_len * 2 + 1:
if path_len > 0 and len(data) >= 12 + path_len + (path_len * path_hash_len) + 1:
# Extract path with hash and SNR pairs
for i in range(path_len):
node = {
"hash": f"{data[12+i]:02x}",
# SNR is stored as a signed byte representing SNR * 4
"snr": (
data[12 + path_len + i]
if data[12 + path_len + i] < 128
else data[12 + path_len + i] - 256
)
/ 4.0,
"hash": dbuf.read(path_hash_len).hex(),
}
path_nodes.append(node)
for n in path_nodes:
node_snr = int.from_bytes(dbuf.read(1), byteorder="little", signed=True)
n["snr"] = node_snr / 4.0
# Add the final node (our device) with its SNR
final_snr_byte = data[12 + path_len * 2]
final_snr = (
final_snr_byte if final_snr_byte < 128 else final_snr_byte - 256
) / 4.0
final_snr = int.from_bytes(dbuf.read(1), byteorder="little", signed=True) / 4.0
path_nodes.append({"snr": final_snr})
res["path"] = path_nodes