Fixed error logging. Added more logging of SIM info.

api/modem/sms/sms.go

@@ -33,12 +33,13 @@ func (d *dialer) Init() error {
 	if !d.port.IsConnected() {
 		return fmt.Errorf("serial port is not connected")
 	}
+
 	// Ensure text format
 	if resp, err := d.port.Send("AT+CMGF=1"); err != nil || !resp.Check() {
 		if err != nil {
-			return fmt.Errorf("AT+CMGF=1 request: %w", err)
+			return fmt.Errorf("set to text format request: %w", err)
 		}
-		return fmt.Errorf("failed to set SMS format")
+		return fmt.Errorf("set SIM format: error response: %s", resp)
 	}
 	return nil
 }
@@ -52,6 +53,7 @@ func (d *dialer) Send(number, msg string) error {
 	if at.Resp(resp).Check() {
 		return nil
 	}
+	d.logger.Println("SEND RESPONSE:", resp)
 	errCode, err := GetError([]byte(resp))
 	if err != nil {
 		return fmt.Errorf("send sms failed and failed to get error: %w", err)