refactor sending data to remote server

works as expected now, but far from perfect

src/modem.rs

@@ -178,21 +178,24 @@ impl<UART: serial::Uart> Modem<UART> {
         self.read_response(cmd.contains, cmd.timeout)
     }
 
-    fn send_command_data(&mut self, cmd: Command, payload: &str) -> Result<String> {
-        println!("-----------------------------------------------------------");
-        println!("Sending {} ...", cmd.text);
-        let _ = self.send_bytes(cmd.text.as_bytes())?;
-
-        let prompt: String = self.rx.reset(cmd.timeout)
-            .map(|b| char::from(b))
-            .take_while(|c| *c != ' ')
-            .collect();
-
-        if prompt != ">".to_string() {
-            println!("invalid prompt: {}", prompt);
+    fn send_data(&mut self, payload: &str) -> Result<String> {
+        let _ = self.send_bytes("AT+CIPSEND".as_bytes())?;
+        for c in self.rx.reset(Duration::from_millis(2000)).map(char::from) {
+            println!("{}", c);
+            if c == '>' {
+                for b in payload.as_bytes() {
+                    self.send(*b)?;
+                }
+                self.send(26)?;
+                return self.read_response(Some("DATA ACCEPT".to_string()), Duration::from_millis(3000));
+            }
         }
-        let _ = self.send_bytes(payload.as_bytes())?;
-        self.read_response(cmd.contains, cmd.timeout)
+        self.send_command(Command {
+            text: "AT+CIPACK".to_string(),
+            contains: Some("OK".to_string()),
+            timeout: Duration::from_millis(3000),
+        })?;
+        Ok("OK".to_string())
     }
 
     pub fn get_ip_addr(&mut self) -> Result<String> {
@@ -259,8 +262,7 @@ impl<UART: serial::Uart> Modem<UART> {
     }
 
     pub fn tcp_send(&mut self, payload: &str) -> Result<()> {
-        self.send_command(Command::tcp_send_size(payload.len()))?;
-        self.send_command_data(Command::tcp_send(), payload)?;
+        self.send_data(payload)?;
         Ok(())
     }
 }