From 8f0f72b5f8f31128c731ede2966730d5f980540b Mon Sep 17 00:00:00 2001
From: Bryce Salmi <bryce@faradayrf.com>
Date: Sat, 11 Mar 2017 21:42:02 -0800
Subject: [PATCH] Added APRS equations packet support

TelemetryEquationsReport will generate a string of equation parameters to
scale telemetry data to.
---
 aprslib/packets/__init__.py           |  3 +-
 aprslib/packets/telemetryequations.py | 47 +++++++++++++++++++++++++++
 2 files changed, 49 insertions(+), 1 deletion(-)
 create mode 100644 aprslib/packets/telemetryequations.py

diff --git a/aprslib/packets/__init__.py b/aprslib/packets/__init__.py
index 2ea2558..1a74d58 100644
--- a/aprslib/packets/__init__.py
+++ b/aprslib/packets/__init__.py
@@ -1,4 +1,5 @@
 from aprslib.packets.position import PositionReport
 from aprslib.packets.telemetry import TelemetryReport
 from aprslib.packets.telemetryunitlabels import TelemetryUnitLabelsReport
-from aprslib.packets.telemetryparameters import TelemetryParametersReport
\ No newline at end of file
+from aprslib.packets.telemetryparameters import TelemetryParametersReport
+from aprslib.packets.telemetryequations import TelemetryEquationsReport
\ No newline at end of file
diff --git a/aprslib/packets/telemetryequations.py b/aprslib/packets/telemetryequations.py
new file mode 100644
index 0000000..1a2e6cf
--- /dev/null
+++ b/aprslib/packets/telemetryequations.py
@@ -0,0 +1,47 @@
+from aprslib.packets.base import APRSPacket
+
+class TelemetryEquationsReport(APRSPacket):
+    format = 'raw'
+    telemetrystation = "N0CALL"
+    a1a = "0.0"
+    a1b = "9999.0"
+    a1c = "0.0"
+    a2a = "0.0"
+    a2b = "1.0"
+    a2c = "0.0"
+    a3a = "0.0"
+    a3b = "1.0"
+    a3c = "0.0"
+    a4a = "0.0"
+    a4b = "1.0"
+    a4c = "0.0"
+    a5a = "0.0"
+    a5b = "1.0"
+    a5c = "0.0"
+
+    def _serialize_body(self):
+
+        body = [
+            ':{0} :EQNS.'.format(self.telemetrystation),  # packet type
+            self.a1a,
+            self.a1b,
+            self.a1c,
+            self.a2a,
+            self.a2b,
+            self.a2c,
+            self.a3a,
+            self.a3b,
+            self.a3c,
+            self.a4a,
+            self.a4b,
+            self.a4c,
+            self.a5a,
+            self.a5b,
+            self.a5c,
+        ]
+        tmpbody = ",".join(body)
+        badcomma = tmpbody.index(",")
+
+        # remove static but erroneous comma between EQNS. and a1 value
+        # Position can vary due to callsign
+        return tmpbody[:badcomma] + tmpbody[badcomma+1:]