Basic PPPoS / cellullar modem support

Currently only for ESP32 and only as the sole connectivity method (not as a backup).

PUBLISHED_FROM=747eac5aa1dcd4880449eaa24519c724ae52c924

Author: Deomid Ryabkov

.gitignore

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+lib

README.md

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+# PPPoS / cellullar modem support
+
+This library provides IP over serial port. Encapsulation is PPP.
+
+## Settings
+
+```
+  "pppos": {
+    "enable": false,                # Enable PPPoS
+    "uart_no": 1,                   # Which UART to use.
+    "baud_rate": 115200,            # Baud rate, data mode is 8-N-1.
+    "fc_enable": false,             # Enable hardware CTS/RTS flow control
+    "apn": "",                      # APN name
+    "user": "",                     # User name
+    "pass": "",                     # Password
+    "connect_cmd": "ATDT*99***1#",  # AT command to send to initiate PPP data mode
+    "echo_interval": 10,            # LCP Echo interval, seconds
+    "echo_fails": 3,                # Number of failed echos before connection is declared dead are retried
+    "hexdump_enable": false         # Dump all the data sent over UART to stderr
+  }
+```
+
+Default UART pin assignments are used and they can be found [here](https://github.com/cesanta/mongoose-os/blob/aa89bc237e4ba492e791a069617a5c6f74ee63f4/fw/platforms/esp32/src/esp32_uart.c#L228).
+
+## Example configuration
+
+Access Point Name, PPP username and password depend on the operator. They are usually public and can be found [here](http://wiki.apnchanger.org/Main_Page).
+
+Here's an example for Vodafone Ireland:
+
+```
+"pppos": {
+  "enable": true,
+  "uart_no": 1,
+  "apn": "live.vodafone.ie",
+  "user": "dublin",
+  "pass": "dublin",
+}
+```

include/mgos_pppos.h

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+/*
+ * Copyright (c) 2014-2017 Cesanta Software Limited
+ * All rights reserved
+ */
+
+#ifndef CS_MOS_LIBS_PPPOS_INCLUDE_MGOS_PPPOS_H_
+#define CS_MOS_LIBS_PPPOS_INCLUDE_MGOS_PPPOS_H_
+
+#include "mgos_net.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+bool mgos_pppos_dev_get_ip_info(int if_instance,
+                                struct mgos_net_ip_info *ip_info);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* CS_MOS_LIBS_PPPOS_INCLUDE_MGOS_PPPOS_H_ */

mos.yml

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+author: mongoose-os
+description: PPPoS support
+type: lib
+version: 1.0
+
+platforms: [ esp32 ]
+
+includes: [ include ]
+sources: [ src ]
+
+config_schema:
+  - ["pppos", "o", {title: "PPPoS settings"}]
+  - ["pppos.enable", "b", false, {title: "Enable PPPoS"}]
+  - ["pppos.uart_no", "i", 1, {title: "Which UART to use"}]
+  - ["pppos.baud_rate", "i", 115200, {title: "Baud rate"}]
+  - ["pppos.fc_enable", "b", false, {title: "Enable hardware CTS/RTS flow control"}]
+  # These depend on the operator and are usually well known.
+  - ["pppos.apn", "s", "", {title: "APN name"}]
+  - ["pppos.user", "s", "", {title: "User name"}]
+  - ["pppos.pass", "s", "", {title: "Password"}]
+  - ["pppos.connect_cmd", "s", "ATDT*99***1#", {title: "AT command to send to initiate PPP data mode"}]
+  # Misc settings.
+  - ["pppos.echo_interval", "i", 10, {title: "LCP Echo interval, seconds"}]
+  - ["pppos.echo_fails", "i", 3, {title: "Number of failed echos before connection is declared dead and retried"}]
+  - ["pppos.hexdump_enable", "b", false, {title: "Dump all the data sent over UART to stderr"}]
+
+tags:
+  - hw
+  - net
+
+manifest_version: 2017-09-29

mos_esp32.yml

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+build_vars:
+  ESP_IDF_SDKCONFIG_OPTS: "${build_vars.ESP_IDF_SDKCONFIG_OPTS} CONFIG_PPP_SUPPORT=y"