add tcp send/receive command modes

src/command.rs

@@ -279,6 +279,22 @@ impl Command {
         }
     }
 
+    pub fn tcp_transparent_mode() -> Command {
+        Command {
+            text: "AT+CIPMODE=1".to_string(),
+            timeout: Duration::from_millis(3000),
+            contains: Some("OK".to_string()),
+        }
+    }
+
+    pub fn tcp_exit_data_mode() -> Command {
+        Command {
+            text: "ATO".to_string(),
+            timeout: Duration::from_millis(3000),
+            contains: Some("CLOSED".to_string()),
+        }
+    }
+
     pub fn tcp_send() -> Command {
         Command {
             text: "AT+CIPSEND".to_string(),