user32994: I am trying to send AT commands to ESP8266 to get connected with internet with the Wifi.
When I am sending AT and AT+RST command on serial monitor then I am getting OK and ready response which seems perfect.
Then I am sending AT+CWLAP to get list of available wifi networks which is also executing correctly.
AT+CWLAP

+CWLAP:(3,"Moto",-42,"a4:70:d6:7a:fa:6c",1,25,0)
+CWLAP:(4,"PRANJAL",-95,"1c:a5:32:3d:f5:c4",1,-16,0)
+CWLAP:(2,"VIHAN",-94,"c8:3a:35:2f:1d:81",1,-21,0)
+CWLAP:(3,"Tenda",-93,"c8:3a:35:20:a9:b1",9,-4,0)

OK

Then I sent AT+CWMODE? which is also perfect.
AT+CWMODE?

+CWMODE:1

OK

Now I am trying to connect ESP8266 with above listed Wifi with this command, it is sending an ERROR on serial monitor.

AT+CWJAP_DEF="Moto","reset1234"

Error
⸮=IRe"Moto","reset1234"

ERROR

Can anyone suggest me what could be the reason of this issue ?at

user42397: The source of such problems are mostly as under

Bad / loose wiring (power and communication)
software serial is not much reliable
Arduino serial monitor is not a user friendly way of testing out ESP modue

To solve wiring related problems for good check out this design.
To solve communication monitoring problems check out this solution
Use USB to TTL interface to connect ESP module directly to your PC without using an Arduino (find details here)  

32994: <p>I am trying to send <code>AT</code> commands to <code>ESP8266</code> to get connected with internet with the Wifi.</p>

<p>When I am sending <code>AT</code> and <code>AT+RST</code> command on serial monitor then I am getting OK and ready response which seems perfect.</p>

<p>Then I am sending <code>AT+CWLAP</code> to get list of available wifi networks which is also executing correctly.</p>

<pre><code>AT+CWLAP

+CWLAP:(3,"Moto",-42,"a4:70:d6:7a:fa:6c",1,25,0)
+CWLAP:(4,"PRANJAL",-95,"1c:a5:32:3d:f5:c4",1,-16,0)
+CWLAP:(2,"VIHAN",-94,"c8:3a:35:2f:1d:81",1,-21,0)
+CWLAP:(3,"Tenda",-93,"c8:3a:35:20:a9:b1",9,-4,0)

OK
</code></pre>

<p>Then I sent <code>AT+CWMODE?</code> which is also perfect.</p>

<pre><code>AT+CWMODE?

+CWMODE:1

OK
</code></pre>

<p>Now I am trying to connect <code>ESP8266</code> with above listed Wifi with this command, it is sending an ERROR on serial monitor.</p>

<blockquote>
  <p>AT+CWJAP_DEF="Moto","reset1234"</p>
</blockquote>

<p><strong>Error</strong></p>

<pre><code>⸮=IRe"Moto","reset1234"

ERROR
</code></pre>

<p>Can anyone suggest me what could be the reason of this issue ?at</p>
 42397: <p>The source of such problems are mostly as under</p>

<ul>
<li>Bad / loose wiring (power and communication)</li>
<li>software serial is not much reliable</li>
<li>Arduino serial monitor is not a user friendly way of testing out ESP modue</li>
</ul>

<p>To solve wiring related problems for good check out <a href="http://absaransari.com/2018/01/25/how-to-power-esp8266-from-5v-supply/" rel="nofollow noreferrer">this design</a>.</p>

<p>To solve communication monitoring problems check out <a href="http://absaransari.com/2018/01/27/esp8266-wifi-module-configuration-utility/" rel="nofollow noreferrer">this solution</a></p>

<p>Use USB to TTL interface to connect ESP module directly to your PC without using an Arduino (<a href="http://absaransari.com/2018/01/26/connecting-esp8266-wifi-mobile-with-computer-using-pl2303/" rel="nofollow noreferrer">find details here</a>)  </p>
