Editing SimTX API/Quick start (section)

== Things to notice ==
* '''Two byte orders.''' Protobuf scalars such as <code>double</code>, <code>float</code> and <code>fixed64</code> are little-endian. The IQ sample bytes inside <code>IqBlock.samples</code> are big-endian <code>int16</code>. See [[SimTX API/Data types#Conventions|Conventions]].
* '''The server decides.''' The program asks for 4,800 samples per block. <code>argon.simtx.net</code> caps blocks at 40 ms, so at 48,000 samples per second it delivers 1,920. Always use the values in the IqStreamDescriptor. See [[SimTX API/Receiver session#Negotiation|Negotiation]].
* '''Power.''' A sample magnitude of 1.0 is −12 dBm at the receiver input, so a block's mean power in dBm is −12 + 10 × log<sub>10</sub>(mean(I² + Q²)).
* '''Sequence numbers.''' Blocks are numbered from 1. A gap in <code>sequence</code> means the client fell behind and the server dropped blocks.
* '''Rejections are explicit.''' If the server cannot place the receiver, for example because a limit is reached, the SessionStatus says <code>SESSION_STATE_REJECTED</code> with an [[SimTX API/Data types#ErrorCode|ErrorCode]] and a reason, and the server closes the connection.