First working version of the MasterMACS EPICS driver

Also added some test code

utils/macmaster.py

@@ -0,0 +1,53 @@
+"""
+  Usage: macmaster.py  macmasterhost port
+    Listen for commands to send and returns reponse
+    until exit has been typed
+
+    Mark Koennecke, March 2023
+"""
+
+import socket
+import struct
+
+
+class MasterMACS():
+    def __init__(self, host, port):
+        self._socke = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+        self._socke.connect((host, int(port)))
+
+    def send(self, command):
+        buf = struct.pack('BBBB', 0x05, len(command) + 4, 0,  0x19)
+        buf += bytes(command, 'utf-8')
+        buf += struct.pack('BB', 0x0D, 0x03)
+        self._socke.send(buf)
+
+    def receive(self):
+        buf = self._socke.recv(35, socket.MSG_WAITALL)
+        if len(buf) < 35:
+            raise  EOFException('Master MACS returned only %d bytes, 30 expected' % len(buf))
+        idx = buf.find(0x0D)
+        ackbyte = buf[idx-1]
+        if ackbyte == 0x06:
+            ack = 'ACK'
+        elif ackbyte == 0x15:
+            ack = 'NAK',
+        else:
+            ack = 'NO'
+        reply = buf[4:idx-1].decode('utf-8')
+        return ack, reply
+
+if __name__ == "__main__":
+    from sys import argv, exit, stdin
+    if len(argv) < 3:
+        print('Usage:\n\tmacmaster.py machost macport')
+        exit(1)
+    mac = MasterMACS(argv[1], argv[2])
+    while(True):
+        # import pdb; pdb.set_trace()
+        line = stdin.readline()
+        if line.find('exit') >= 0:
+            exit(0)
+        mac.send(line.strip())
+        ack, reply = mac.receive()
+        print('%s, %s' %(ack, reply))
+