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115	115	= 4. Connect to AWS using Dragino-NB device =
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	118	+(% id="cke_bm_37736S" style="color: red; display: none" %)** **(% style="color:red" %)**Note: **(%%)In order to avoid problems with certificate writing, you need to set the serial port assistant to automatically add a newline character when sending commands, if there is no such newline character, the certificate written will be invalid.(Using the serial port assistant as an example)
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	120	+[[image:image-20240814155410-1.png||height="328" width="563"]]
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117	117	== 4.1 For -NB /-NS model ==
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119	119	=== 4.1.1 Upgrade the firmware to configure TTS firmware to set the certificate ===
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136	136	=== 4.1.2 Configure certificate ===
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138		-(% style="color:red" %)**Note: **(%%)In order to avoid problems with certificate writing, you need to set the serial port assistant to automatically add a newline character when sending commands, if there is no such newline character, the certificate written will be invalid.(Using the serial port assistant as an example)
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140		-[[image:image-20240814155410-1.png||height="328" width="563"]]
141		-
142	142	After upgrade the firmware, the serial port displays as follows：
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144	144	[[image:image-20240528174330-13.png||height="286" width="568"]]