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<?xml-stylesheet type="text/xsl" href="https://devzone.nordicsemi.com/cfs-file/__key/system/syndication/rss.xsl" media="screen"?><rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:slash="http://purl.org/rss/1.0/modules/slash/" xmlns:wfw="http://wellformedweb.org/CommentAPI/" xmlns:atom="http://www.w3.org/2005/Atom"><channel><title>How to increase the data rate</title><link>https://devzone.nordicsemi.com/f/nordic-q-a/42108/how-to-increase-the-data-rate</link><description>Hi, I want to send 9000bytes one sencond.But when I send these bytes it will return error code is 19. 
 I had increased the ATT MTU to 274 with the function of nrf_ble_gatt_att_mtu_periph_set(&amp;amp;m_gatt, 247); I use SDK15.0 
 anyboby konw why?</description><dc:language>en-US</dc:language><generator>Telligent Community 13</generator><lastBuildDate>Mon, 14 Jan 2019 14:29:38 GMT</lastBuildDate><atom:link rel="self" type="application/rss+xml" href="https://devzone.nordicsemi.com/f/nordic-q-a/42108/how-to-increase-the-data-rate" /><item><title>RE: How to increase the data rate</title><link>https://devzone.nordicsemi.com/thread/165509?ContentTypeID=1</link><pubDate>Mon, 14 Jan 2019 14:29:38 GMT</pubDate><guid isPermaLink="false">137ad170-7792-4731-bb38-c0d22fbe4515:04672ca9-ab30-4196-9fc7-7e4fc26bd306</guid><dc:creator>Bj&amp;#248;rn Kvaale</dc:creator><description>&lt;p&gt;The max ATT MTU size you can use is 247. See &lt;a href="https://www.nordicsemi.com/DocLib/Content/SDK_Doc/nRF5_SDK/v15-2-0/ble_sdk_app_att_mtu"&gt;this documentation&lt;/a&gt;: &amp;quot;ATT_MTU size: The default Maximum Transmission Unit (MTU) is 23 bytes. When increasing this value, longer ATT payloads can be achieved, increasing ATT throughput.&amp;quot;&lt;/p&gt;
&lt;p&gt;You tried to increase the att mtu size even higher, which is not possible.&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: How to increase the data rate</title><link>https://devzone.nordicsemi.com/thread/164610?ContentTypeID=1</link><pubDate>Wed, 09 Jan 2019 06:16:31 GMT</pubDate><guid isPermaLink="false">137ad170-7792-4731-bb38-c0d22fbe4515:49f5070d-c9d6-42b7-8f89-b2149c9e125e</guid><dc:creator>Ryon_pan</dc:creator><description>&lt;p&gt;Thank you for your reply.I use the version of SDK is 15.0.I just want to know if I want to&amp;nbsp; send more data one time.And how to do that.&lt;/p&gt;
&lt;p&gt;I will take a look at these links which was recommend by you.&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: How to increase the data rate</title><link>https://devzone.nordicsemi.com/thread/164503?ContentTypeID=1</link><pubDate>Tue, 08 Jan 2019 11:58:18 GMT</pubDate><guid isPermaLink="false">137ad170-7792-4731-bb38-c0d22fbe4515:7597823f-af7f-4fd7-9575-98def0a865b1</guid><dc:creator>Bj&amp;#248;rn Kvaale</dc:creator><description>&lt;p&gt;&lt;a href="https://devzone.nordicsemi.com/members/ryon_5f00_pan"&gt;Ryon_pan&lt;/a&gt;Which example are you currently running? Which SDK version are you using? I would recommend taking a look at the &lt;a href="https://www.nordicsemi.com/DocLib/Content/SDK_Doc/nRF5_SDK/v15-2-0/ble_sdk_app_att_mtu"&gt;ATT MTU throughput example&lt;/a&gt; from SDK v15.2, as well as these links: &lt;a href="https://github.com/NordicPlayground/nrf528xx-ble-throughput-demo"&gt;link 1&lt;/a&gt;,&amp;nbsp;&lt;a href="https://github.com/NordicPlayground/nrf52-ble-image-transfer-demo"&gt;link 2&lt;/a&gt;&amp;nbsp;&amp;amp; &lt;a href="https://devzone.nordicsemi.com/b/blog/posts/throughput-and-long-range-demo"&gt;link 3&lt;/a&gt;. &lt;a href="https://devzone.nordicsemi.com/f/nordic-q-a/37415/can-not-get-high-enough-throughput-using-ble-nus"&gt;This link&lt;/a&gt; should also be helpful.&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: How to increase the data rate</title><link>https://devzone.nordicsemi.com/thread/163863?ContentTypeID=1</link><pubDate>Fri, 04 Jan 2019 01:41:42 GMT</pubDate><guid isPermaLink="false">137ad170-7792-4731-bb38-c0d22fbe4515:d3836dcd-095a-4c86-bbeb-f56eb173a7d8</guid><dc:creator>awneil</dc:creator><description>&lt;p&gt;Have you tried stepping through the code to see what, exactly, causes it?&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: How to increase the data rate</title><link>https://devzone.nordicsemi.com/thread/163862?ContentTypeID=1</link><pubDate>Fri, 04 Jan 2019 01:27:58 GMT</pubDate><guid isPermaLink="false">137ad170-7792-4731-bb38-c0d22fbe4515:f9c3115c-552c-4ad1-bf3f-929cb0028504</guid><dc:creator>Ryon_pan</dc:creator><description>&lt;p&gt;The meaning of that code is not enough resources for operation.But I dont know what the meaning of it&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: How to increase the data rate</title><link>https://devzone.nordicsemi.com/thread/163800?ContentTypeID=1</link><pubDate>Thu, 03 Jan 2019 14:54:57 GMT</pubDate><guid isPermaLink="false">137ad170-7792-4731-bb38-c0d22fbe4515:95a8b0e1-6bd5-46f4-8388-05c60846f7b2</guid><dc:creator>awneil</dc:creator><description>[quote userid="75513" url="~/f/nordic-q-a/42108/how-to-increase-the-data-rate"]it will return error code is 19[/quote]
&lt;p&gt;&lt;em&gt;&lt;strong&gt;What&lt;/strong&gt; &lt;/em&gt;will ?&lt;/p&gt;
&lt;p&gt;Have you looked-up the meaning of that code?&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item></channel></rss>