<div dir="ltr"><p>Hey guys. I’m trying to connect 3+ modems on my PI, all of these 
modems are working if I connect them individually, but once I connect 
all of them together I get at least one that can’t get a connection.</p>
<p>Something always happens on the third modem that makes it stay in a unknown state:</p>
<pre><code class="gmail-hljs gmail-sql">  <span class="gmail-hljs-comment">-------------------------</span>
  General <span class="gmail-hljs-operator">|</span>           path: <span class="gmail-hljs-operator">/</span>org<span class="gmail-hljs-operator">/</span>freedesktop<span class="gmail-hljs-operator">/</span>ModemManager1<span class="gmail-hljs-operator">/</span>Modem<span class="gmail-hljs-operator">/</span><span class="gmail-hljs-number">3</span>
  <span class="gmail-hljs-comment">-------------------------</span>
  <span class="gmail-hljs-keyword">System</span>  <span class="gmail-hljs-operator">|</span>         device: <span class="gmail-hljs-operator">/</span>sys<span class="gmail-hljs-operator">/</span>devices<span class="gmail-hljs-operator">/</span>platform<span class="gmail-hljs-operator">/</span>soc<span class="gmail-hljs-operator">/</span><span class="gmail-hljs-number">3</span>f980000.usb<span class="gmail-hljs-operator">/</span>usb1<span class="gmail-hljs-operator">/</span><span class="gmail-hljs-number">1</span><span class="gmail-hljs-number">-1</span><span class="gmail-hljs-operator">/</span><span class="gmail-hljs-number">1</span><span class="gmail-hljs-number">-1.1</span><span class="gmail-hljs-operator">/</span><span class="gmail-hljs-number">1</span><span class="gmail-hljs-number">-1.1</span><span class="gmail-hljs-number">.2</span><span class="gmail-hljs-operator">/</span><span class="gmail-hljs-number">1</span><span class="gmail-hljs-number">-1.1</span><span class="gmail-hljs-number">.2</span><span class="gmail-hljs-number">.4</span><span class="gmail-hljs-operator">/</span><span class="gmail-hljs-number">1</span><span class="gmail-hljs-number">-1.1</span><span class="gmail-hljs-number">.2</span><span class="gmail-hljs-number">.4</span><span class="gmail-hljs-number">.6</span>
          <span class="gmail-hljs-operator">|</span>        drivers: qmi_wwan, option
          <span class="gmail-hljs-operator">|</span>         plugin: generic
          <span class="gmail-hljs-operator">|</span>   <span class="gmail-hljs-keyword">primary</span> port: cdc<span class="gmail-hljs-operator">-</span>wdm2
          <span class="gmail-hljs-operator">|</span>          ports: cdc<span class="gmail-hljs-operator">-</span>wdm2 (qmi), ttyUSB7 (<span class="gmail-hljs-keyword">at</span>), ttyUSB8 (<span class="gmail-hljs-keyword">at</span>), wwan2 (net)
  <span class="gmail-hljs-comment">-------------------------</span>
  Status  <span class="gmail-hljs-operator">|</span> signal quality: <span class="gmail-hljs-number">0</span><span class="gmail-hljs-operator">%</span> (cached)
  <span class="gmail-hljs-comment">-------------------------</span>
  Modes   <span class="gmail-hljs-operator">|</span>      supported: allowed: <span class="gmail-hljs-keyword">any</span>; preferred: <span class="gmail-hljs-keyword">none</span>
          <span class="gmail-hljs-operator">|</span>        <span class="gmail-hljs-keyword">current</span>: allowed: <span class="gmail-hljs-keyword">any</span>; preferred: <span class="gmail-hljs-keyword">none</span>
</code></pre>
<p>This modem works when I connect it by itself. I also tested 
different permutations and it seems it’s always the third modem that 
can’t get a connection, independently of which one I put on first. This is the 
full log with debug on: <a href="https://pastebin.com/L3QWBppt">https://pastebin.com/L3QWBppt</a></p><p>Any ideas?<br></p></div>