Fix strToUInt32 (#2)

Now the data should be correct.

reader/reader.py

@@ -37,7 +37,15 @@ def print_table(df):
     df = read_parquet_file(file_path)
 
     # print the data table
-    print_table(df)
+    # print_table(df)
+
+    timestamp = df.iloc[0, 0]
+    noise = df.iloc[0, 1]
+
+    # print timestamp and noise in HEX
+    print('timestamp: ', hex(timestamp))
+    print('noise: ', hex(noise))
+
 
     # end time
     end_time = time.time()

src/pkt_parse.cpp

@@ -81,5 +81,8 @@ uint32_t Pkt_Parse::Data::bytesToUInt32(const std::array<std::byte, 4>& bytes) {
 
 uint32_t Pkt_Parse::Data::strToUInt32(const std::string& str) {
     assert(str.size() == 4); // str must be length of 4
-    return str[0] << 24 | str[1] << 16 | str[2] << 8 | str[3];
+    return (static_cast<uint32_t>(static_cast<uint8_t>(str[0])) << 24) |
+           (static_cast<uint32_t>(static_cast<uint8_t>(str[1])) << 16) |
+           (static_cast<uint32_t>(static_cast<uint8_t>(str[2])) << 8) |
+           static_cast<uint32_t>(static_cast<uint8_t>(str[3]));
 }

tests/udp_sender.py

@@ -8,12 +8,14 @@
 import time
 import argparse
 
-message = "#" + "0" * 1039 # 1040 bytes
+message = b"\x31\xd4\x91\xb2\x34\x01\xd2\x04" + b"\x00" * 1032
+
+print(len(message))
 
 def send_udp_packet(host, port, data, quiet=False):
     try:
         sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
-        sock.sendto(data.encode(), (host, port))
+        sock.sendto(data, (host, port))
         if not quiet:
             print(f"Sent packet with length {len(data)} to {host}:{port}")
     except Exception as e: