Updated JSON.mkd

Added details on the "modem_configuration" command.

1 files changed, 22 insertions, 0 deletions

diff --git a/JSON.mkd b/JSON.mkd
index 069f74b4..bcc0dfd2 100644
--- a/JSON.mkd
+++ b/JSON.mkd
@@ -373,3 +373,25 @@ the response will be `true`.
 
     { "command_response": "predefined_obd2", "status": true}
 
+### CELLULAR C5 CONFIGURATION
+
+The ModemConfigurationCommand message allows users to change certain aspects of modem operation on-the-fly (at runtime). The modem configuration settings are stored in flash memory and are untouched by the bootloader during a software update (assuming the correct cellular_c5 linker file is used during compilation of vi-firmware). Thus, new modem settings persistent across power cycles.
+
+The ModemConfigurationCommand message provides three sub-messages for particular groups of modem settings. These are NetworkOperatorSettings, NetworkDataSettings, and ServerConnectSettings. These configuration messages are described in great detail within the cellular_c5_config documentation. 
+
+Currently, only the ServerConnectSettings sub-message is supported in the vi-firmware's command interpreter. All other settings are currently compile-time only.
+
+The ServerConnectSettings command allows the user to set the host server name and port that the device will use when opening a TCP socket to upload data. This destination must be running an HTTP server similar to OpenXCWebServer, which defines a set of supported HTTP transactions where the body carries data to/from the device in the familiar OpenXC Message Format.
+
+**Request**
+
+    { "command": "modem_configuration",
+      "server": {
+		"host": "www.myhost.com",
+		"port": 10000
+	  }
+    }
+
+**Response**
+
+	{ "command_response": "modem_configuration", "status": true}
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