libs/unit: Add Unit Cat1 support.

Signed-off-by: tinyu <tinyu.zhao@gmail.com>

Author: TinyuZhao

m5stack/libs/driver/manifest.py

@@ -47,6 +47,7 @@
         "rotary/rotary.py",
         "simcom/__init__.py",
         "simcom/common.py",
+        "simcom/ml307r.py",
         "simcom/sim7020.py",
         "simcom/sim7028.py",
         "simcom/sim7080.py",

m5stack/libs/driver/simcom/common.py

@@ -65,7 +65,7 @@ def check_modem_is_ready(self):
         output, error = self.execute_at_command(at, True)
         return not error
 
-    def set_command_echo_mode(self, state=1):
+    def set_command_echo_mode(self, state=0):
         # Set echo mode off or on
         ate = AT_CMD("ATE{}".format(state), "OK", 3)
         output, error = self.execute_at_command(ate)