Differences

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--- exploring_lora [2018/10/13 09:04] – [4.1. Time on Air] samer
+++ exploring_lora [2018/10/13 09:53] – [4.1. Time on Air] samer
@@ Line 134: / Line 134: @@
 As for the theoretical computation of the ToA, you can refer to the the following documents :
-  * The Semtech specification (section 4.1.1.6) http://semtech.com/uploads/documents/DS_SX1276-7-8-9_W_APP_V5.pdf
+  * The Semtech [[http://semtech.com/uploads/documents/DS_SX1276-7-8-9_W_APP_V5.pdf| specification]] (section 4.1.1.6)
-  * https://www.youtube.com/watch?v=C_Rh5GSENA4
+  * An explanatory video: https://www.youtube.com/watch?v=C_Rh5GSENA4
-  * https://www.loratools.nl/#/airtime
+  * Various calculation tools available online: https://www.loratools.nl/#/airtime, [[https://docs.google.com/spreadsheets/d/1voGAtQAjC1qBmaVuP1ApNKs1ekgUjavHuVQIXyYSvNc/edit?usp=sharing |Spreadsheet]]
+Note that all messages sent and received by the [[https://www.airspayce.com/mikem/arduino/RadioHead/classRH__RF95.html| RH_RF95 RadioHead]] driver we are using conform to this packet format:
+  * 8 symbol PREAMBLE
+  * Explicit header with header CRC (handled internally by the radio)
+  * 4 octets HEADER: (TO, FROM, ID, FLAGS)
+  * 0 to 251 octets DATA
+  * CRC (handled internally by the radio)
 <WRAP center round help 100%>